1842

The first documented discovery of gold in California occurs at Rancho San Francisco, six years before the California Gold Rush. Gold is a chemical element with symbol Au and atomic number 79, making it one of the higher atomic number elements that occur naturally. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native) form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the native element silver and also naturally alloyed with copper and palladium. Less commonly, it occurs in minerals as gold compounds, often with tellurium. The first documented discovery of gold in California occurs at Rancho San Francisco, six years before the California Gold Rush. Gold is a chemical element with symbol Au and atomic number 79, making it one of the higher atomic number elements that occur naturally. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native) form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the native element silver and also naturally alloyed with copper and palladium. Less commonly, it occurs in minerals as gold compounds, often with tellurium.

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1843

A Christmas Carol by Charles Dickens (pictured), a novella about the miser Ebenezer Scrooge and his transformation after being visited by three Christmas ghosts, was first published. A Christmas Carol in Prose, Being a Ghost-Story of Christmas, commonly known as A Christmas Carol, is a novella by Charles Dickens, first published in London by Chapman & Hall in 1843; the first edition was illustrated by John Leech. A Christmas Carol tells the story of Ebenezer Scrooge, an old miser who is visited by the ghost of his former business partner Jacob Marley and the Ghosts of Christmas Past, Present and Yet to Come. After their visits Scrooge is transformed into a kinder, gentler man. A Christmas Carol by Charles Dickens (pictured), a novella about the miser Ebenezer Scrooge and his transformation after being visited by three Christmas ghosts, was first published. A Christmas Carol in Prose, Being a Ghost-Story of Christmas, commonly known as A Christmas Carol, is a novella by Charles Dickens, first published in London by Chapman & Hall in 1843; the first edition was illustrated by John Leech. A Christmas Carol tells the story of Ebenezer Scrooge, an old miser who is visited by the ghost of his former business partner Jacob Marley and the Ghosts of Christmas Past, Present and Yet to Come. After their visits Scrooge is transformed into a kinder, gentler man.

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1844

Joseph Smith, founder of the Latter Day Saint movement, and his brother Hyrum Smith, are killed by a mob at the Carthage, Illinois jail. Joseph Smith Jr. was an American religious leader and founder of Mormonism and the Latter Day Saint movement. When he was 24, Smith published the Book of Mormon. By the time of his death fourteen years later, he had attracted tens of thousands of followers and founded a religion that continues to the present. Joseph Smith, founder of the Latter Day Saint movement, and his brother Hyrum Smith, are killed by a mob at the Carthage, Illinois jail. Joseph Smith Jr. was an American religious leader and founder of Mormonism and the Latter Day Saint movement. When he was 24, Smith published the Book of Mormon. By the time of his death fourteen years later, he had attracted tens of thousands of followers and founded a religion that continues to the present.

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1846

The Smithsonian Institution is chartered by the United States Congress after James Smithson donates $500,000. The Smithsonian Institution, established on August 10, 1846 "for the increase and diffusion of knowledge," is a group of museums and research centers administered by the Government of the United States. The institution is named after its founding donor, British scientist James Smithson. Originally organized as the "United States National Museum," that name ceased to exist as an administrative entity in 1967. The Smithsonian Institution is chartered by the United States Congress after James Smithson donates $500,000. The Smithsonian Institution, established on August 10, 1846 "for the increase and diffusion of knowledge," is a group of museums and research centers administered by the Government of the United States. The institution is named after its founding donor, British scientist James Smithson. Originally organized as the "United States National Museum," that name ceased to exist as an administrative entity in 1967.

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1847

After 17 months of travel, Brigham Young leads 148 Mormon pioneers into Salt Lake Valley, resulting in the establishment of Salt Lake City. Brigham Young was an American religious leader, politician, and settler. He was the second president of The Church of Jesus Christ of Latter-day Saints from 1847 until his death in 1877. He founded Salt Lake City and he served as the first governor of the Utah Territory. Young also led the foundings of the precursors to the University of Utah and Brigham Young University. After 17 months of travel, Brigham Young leads 148 Mormon pioneers into Salt Lake Valley, resulting in the establishment of Salt Lake City. Brigham Young was an American religious leader, politician, and settler. He was the second president of The Church of Jesus Christ of Latter-day Saints from 1847 until his death in 1877. He founded Salt Lake City and he served as the first governor of the Utah Territory. Young also led the foundings of the precursors to the University of Utah and Brigham Young University.

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1848

Irish Potato Famine: Tipperary Revolt: In County Tipperary, Ireland, then in the United Kingdom, an unsuccessful nationalist revolt against British rule is put down by police. The Great Famine or the Great Hunger was a period of mass starvation, disease, and emigration in Ireland between 1845 and 1849. With the greatest impacted areas to the west and south of Ireland, where the Irish language was primarily spoken, the period was contemporaneously known as in Irish: An Drochshaol, loosely translated as the hard-times. The worst year of the period, that of "Black 47", is known as Irish: Bliain an Drochshaoil. During the famine, about one million people died and a million more emigrated from Ireland, causing the island's population to fall by between 20% and 25%. Irish Potato Famine: Tipperary Revolt: In County Tipperary, Ireland, then in the United Kingdom, an unsuccessful nationalist revolt against British rule is put down by police. The Great Famine or the Great Hunger was a period of mass starvation, disease, and emigration in Ireland between 1845 and 1849. With the greatest impacted areas to the west and south of Ireland, where the Irish language was primarily spoken, the period was contemporaneously known as in Irish: An Drochshaol, loosely translated as the hard-times. The worst year of the period, that of "Black 47", is known as Irish: Bliain an Drochshaoil. During the famine, about one million people died and a million more emigrated from Ireland, causing the island's population to fall by between 20% and 25%.

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1851

Queen Victoria opens The Great Exhibition at The Crystal Palace in London. Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India. Queen Victoria opens The Great Exhibition at The Crystal Palace in London. Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India.

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1852

Harriet Beecher Stowe's Uncle Tom's Cabin is published. Harriet Elisabeth Beecher Stowe was an American abolitionist and author. She came from the Beecher family, a famous religious family, and is best known for her novel Uncle Tom's Cabin (1852), which depicts the harsh conditions for enslaved African Americans. The book reached millions as a novel and play, and became influential in the United States and Great Britain, energizing anti-slavery forces in the American North, while provoking widespread anger in the South. Stowe wrote 30 books, including novels, three travel memoirs, and collections of articles and letters. She was influential for both her writings and her public stances on social issues of the day. Harriet Beecher Stowe's Uncle Tom's Cabin is published. Harriet Elisabeth Beecher Stowe was an American abolitionist and author. She came from the Beecher family, a famous religious family, and is best known for her novel Uncle Tom's Cabin (1852), which depicts the harsh conditions for enslaved African Americans. The book reached millions as a novel and play, and became influential in the United States and Great Britain, energizing anti-slavery forces in the American North, while provoking widespread anger in the South. Stowe wrote 30 books, including novels, three travel memoirs, and collections of articles and letters. She was influential for both her writings and her public stances on social issues of the day.

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1853

Opening of the first major US world's fair, the Exhibition of the Industry of All Nations in New York City. A world's fair, world fair, world expo, universal exposition, or international exposition is a large international exhibition designed to showcase achievements of nations. These exhibitions vary in character and are held in different parts of the world. The most recent international exhibition, Expo 2017, was held in Astana, Kazakhstan. Opening of the first major US world's fair, the Exhibition of the Industry of All Nations in New York City. A world's fair, world fair, world expo, universal exposition, or international exposition is a large international exhibition designed to showcase achievements of nations. These exhibitions vary in character and are held in different parts of the world. The most recent international exhibition, Expo 2017, was held in Astana, Kazakhstan.

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1854

Henry David Thoreau publishes Walden. Henry David Thoreau was an American essayist, poet, philosopher, abolitionist, naturalist, tax resister, development critic, surveyor, and historian. A leading transcendentalist, Thoreau is best known for his book Walden, a reflection upon simple living in natural surroundings, and his essay "Civil Disobedience", an argument for disobedience to an unjust state. Henry David Thoreau publishes Walden. Henry David Thoreau was an American essayist, poet, philosopher, abolitionist, naturalist, tax resister, development critic, surveyor, and historian. A leading transcendentalist, Thoreau is best known for his book Walden, a reflection upon simple living in natural surroundings, and his essay "Civil Disobedience", an argument for disobedience to an unjust state.

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1856

Queen Victoria established the Victoria Cross, originally to recognise acts of valour by British military personnel during the Crimean War. Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India. Queen Victoria established the Victoria Cross, originally to recognise acts of valour by British military personnel during the Crimean War. Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India.

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1857

Queen Victoria selected Ottawa, then a small logging town, to be the capital of the British colony of Canada. Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India. Queen Victoria selected Ottawa, then a small logging town, to be the capital of the British colony of Canada. Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India.

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1858

U.S. President James Buchanan inaugurates the new transatlantic telegraph cable by exchanging greetings with Queen Victoria of the United Kingdom. However, a weak signal forces a shutdown of the service in a few weeks. James Buchanan Jr. was an American politician who served as the 15th President of the United States (1857–1861), serving immediately prior to the American Civil War. A member of the Democratic Party, he was the 17th United States Secretary of State and had served in the Senate and House of Representatives before becoming president. U.S. President James Buchanan inaugurates the new transatlantic telegraph cable by exchanging greetings with Queen Victoria of the United Kingdom. However, a weak signal forces a shutdown of the service in a few weeks. James Buchanan Jr. was an American politician who served as the 15th President of the United States (1857–1861), serving immediately prior to the American Civil War. A member of the Democratic Party, he was the 17th United States Secretary of State and had served in the Senate and House of Representatives before becoming president.

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1859

Julia A J Floding was 18 years old when Petroleum is discovered in Titusville, Pennsylvania leading to the world's first commercially successful oil well. Petroleum is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earth's surface. It is commonly refined into various types of fuels. Components of petroleum are separated using a technique called fractional distillation, i.e. separation of a liquid mixture into fractions differing in boiling point by means of distillation, typically using a fractionating column. Petroleum is discovered in Titusville, Pennsylvania leading to the world's first commercially successful oil well. Petroleum is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earth's surface. It is commonly refined into various types of fuels. Components of petroleum are separated using a technique called fractional distillation, i.e. separation of a liquid mixture into fractions differing in boiling point by means of distillation, typically using a fractionating column.

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1860

Julia A J Floding was 19 years old when Abraham Lincoln is elected as the 16th President of United States. Abraham Lincoln was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865. Lincoln led the United States through the American Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis. In doing so, he preserved the Union, abolished slavery, strengthened the federal government, and modernized the economy. Abraham Lincoln is elected as the 16th President of United States. Abraham Lincoln was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865. Lincoln led the United States through the American Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis. In doing so, he preserved the Union, abolished slavery, strengthened the federal government, and modernized the economy.

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1861

Julia A J Floding was 19 years old when American Civil War: Fort Sumter surrenders to Confederate forces. The American Civil War was a war fought in the United States from 1861 to 1865. As a result of the long-standing controversy over slavery, war broke out in April 1861, when Confederate forces attacked Fort Sumter in South Carolina, shortly after U.S. President Abraham Lincoln was inaugurated. The nationalists of the Union proclaimed loyalty to the U.S. Constitution. They faced secessionists of the Confederate States, who advocated for states' rights to expand slavery. American Civil War: Fort Sumter surrenders to Confederate forces. The American Civil War was a war fought in the United States from 1861 to 1865. As a result of the long-standing controversy over slavery, war broke out in April 1861, when Confederate forces attacked Fort Sumter in South Carolina, shortly after U.S. President Abraham Lincoln was inaugurated. The nationalists of the Union proclaimed loyalty to the U.S. Constitution. They faced secessionists of the Confederate States, who advocated for states' rights to expand slavery.

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1862

Cinco de Mayo: Troops led by Ignacio Zaragoza halt a French invasion in the Battle of Puebla in Mexico. Cinco de Mayo is an annual celebration held on May 5. The date is observed to commemorate the Mexican Army's unlikely victory over the French Empire at the Battle of Puebla, on May 5, 1862, under the leadership of General Ignacio Zaragoza. Cinco de Mayo: Troops led by Ignacio Zaragoza halt a French invasion in the Battle of Puebla in Mexico. Cinco de Mayo is an annual celebration held on May 5. The date is observed to commemorate the Mexican Army's unlikely victory over the French Empire at the Battle of Puebla, on May 5, 1862, under the leadership of General Ignacio Zaragoza.

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1864

The Indian city of Calcutta is almost totally destroyed by a cyclone; 60,000 die. Kolkata is the capital of the Indian state of West Bengal. Located on the east bank of the Hooghly River, it is the principal commercial, cultural, and educational centre of East India, while the Port of Kolkata is India's oldest operating port and its sole major riverine port. The city is widely regarded as the "cultural capital" of India, and is also nicknamed the "City of Joy". In 2011, the city had a population of 4.5 million, while the population of the city and its suburbs was 14.1 million, making it the third-most populous metropolitan area in India. Recent estimates of Kolkata Metropolitan Area's economy have ranged from $60 to $150 billion making it third most-productive metropolitan area in India, after Mumbai and Delhi. The Indian city of Calcutta is almost totally destroyed by a cyclone; 60,000 die. Kolkata is the capital of the Indian state of West Bengal. Located on the east bank of the Hooghly River, it is the principal commercial, cultural, and educational centre of East India, while the Port of Kolkata is India's oldest operating port and its sole major riverine port. The city is widely regarded as the "cultural capital" of India, and is also nicknamed the "City of Joy". In 2011, the city had a population of 4.5 million, while the population of the city and its suburbs was 14.1 million, making it the third-most populous metropolitan area in India. Recent estimates of Kolkata Metropolitan Area's economy have ranged from $60 to $150 billion making it third most-productive metropolitan area in India, after Mumbai and Delhi.

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1865

President Abraham Lincoln dies after being shot the previous evening by actor John Wilkes Booth. Vice President Andrew Johnson becomes President upon Lincoln's death. Abraham Lincoln was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865. Lincoln led the United States through the American Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis. In doing so, he preserved the Union, abolished slavery, strengthened the federal government, and modernized the economy. President Abraham Lincoln dies after being shot the previous evening by actor John Wilkes Booth. Vice President Andrew Johnson becomes President upon Lincoln's death. Abraham Lincoln was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865. Lincoln led the United States through the American Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis. In doing so, he preserved the Union, abolished slavery, strengthened the federal government, and modernized the economy.

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1866

President Andrew Johnson formally declares the American Civil War over. The President of the United States (POTUS) is the head of state and head of government of the United States of America. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces. President Andrew Johnson formally declares the American Civil War over. The President of the United States (POTUS) is the head of state and head of government of the United States of America. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces.

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1867

Alaska is purchased from Russia for $7.2 million, about 2-cent/acre ($4.19/km²), by United States Secretary of State William H. Seward. The Alaska Purchase was the United States' acquisition of Alaska from the Russian Empire on March 30, 1867, by a treaty ratified by the United States Senate, and signed by President Andrew Johnson. Alaska is purchased from Russia for $7.2 million, about 2-cent/acre ($4.19/km²), by United States Secretary of State William H. Seward. The Alaska Purchase was the United States' acquisition of Alaska from the Russian Empire on March 30, 1867, by a treaty ratified by the United States Senate, and signed by President Andrew Johnson.

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1868

The 14th Amendment to the United States Constitution is ratified, guaranteeing African Americans full citizenship and all persons in the United States due process of law. The Fourteenth Amendment to the United States Constitution was adopted on July 9, 1868, as one of the Reconstruction Amendments. The amendment addresses citizenship rights and equal protection of the laws and was proposed in response to issues related to former slaves following the American Civil War. The amendment was bitterly contested, particularly by the states of the defeated Confederacy, which were forced to ratify it in order to regain representation in Congress. The amendment, particularly its first section, is one of the most litigated parts of the Constitution, forming the basis for landmark decisions such as Brown v. Board of Education (1954) regarding racial segregation, Roe v. Wade (1973) regarding abortion, Bush v. Gore (2000) regarding the 2000 presidential election, and Obergefell v. Hodges (2015) regarding same-sex marriage. The amendment limits the actions of all state and local officials, including those acting on behalf of such an official. The 14th Amendment to the United States Constitution is ratified, guaranteeing African Americans full citizenship and all persons in the United States due process of law. The Fourteenth Amendment to the United States Constitution was adopted on July 9, 1868, as one of the Reconstruction Amendments. The amendment addresses citizenship rights and equal protection of the laws and was proposed in response to issues related to former slaves following the American Civil War. The amendment was bitterly contested, particularly by the states of the defeated Confederacy, which were forced to ratify it in order to regain representation in Congress. The amendment, particularly its first section, is one of the most litigated parts of the Constitution, forming the basis for landmark decisions such as Brown v. Board of Education (1954) regarding racial segregation, Roe v. Wade (1973) regarding abortion, Bush v. Gore (2000) regarding the 2000 presidential election, and Obergefell v. Hodges (2015) regarding same-sex marriage. The amendment limits the actions of all state and local officials, including those acting on behalf of such an official.

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1869

Julia A J Floding was 27 years old when Susan B. Anthony and Elizabeth Cady Stanton founded the National Woman Suffrage Association, breaking away from the American Equal Rights Association which they had also previously founded. Susan B. Anthony was an American social reformer and women's rights activist who played a pivotal role in the women's suffrage movement. Born into a Quaker family committed to social equality, she collected anti-slavery petitions at the age of 17. In 1856, she became the New York state agent for the American Anti-Slavery Society. Susan B. Anthony and Elizabeth Cady Stanton founded the National Woman Suffrage Association, breaking away from the American Equal Rights Association which they had also previously founded. Susan B. Anthony was an American social reformer and women's rights activist who played a pivotal role in the women's suffrage movement. Born into a Quaker family committed to social equality, she collected anti-slavery petitions at the age of 17. In 1856, she became the New York state agent for the American Anti-Slavery Society.

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1872

Yellowstone National Park (bison pictured), the first national park in the world, was established with the majority of it in the U.S. state of Wyoming. Yellowstone National Park is an American national park located in Wyoming, Montana, and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone was the first national park in the U.S. and is also widely held to be the first national park in the world. The park is known for its wildlife and its many geothermal features, especially Old Faithful geyser, one of its most popular features. It has many types of ecosystems, but the subalpine forest is the most abundant. It is part of the South Central Rockies forests ecoregion. Yellowstone National Park (bison pictured), the first national park in the world, was established with the majority of it in the U.S. state of Wyoming. Yellowstone National Park is an American national park located in Wyoming, Montana, and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone was the first national park in the U.S. and is also widely held to be the first national park in the world. The park is known for its wildlife and its many geothermal features, especially Old Faithful geyser, one of its most popular features. It has many types of ecosystems, but the subalpine forest is the most abundant. It is part of the South Central Rockies forests ecoregion.

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1874

Julia A J Floding was 33 years old when Winston Churchill, English colonel, journalist, and politician, Prime Minister of the United Kingdom, Nobel Prize laureate (d. 1965) Sir Winston Leonard Spencer-Churchill was a British politician, army officer, and writer, who was Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955. As Prime Minister, Churchill led Britain to victory in the Second World War. Churchill represented five constituencies during his career as Member of Parliament (MP). Ideologically an economic liberal and British imperialist, he began and ended his parliamentary career as a member of the Conservative Party, which he led from 1940 to 1955, but for twenty years from 1904 he was a prominent member of the Liberal Party. Winston Churchill, English colonel, journalist, and politician, Prime Minister of the United Kingdom, Nobel Prize laureate (d. 1965) Sir Winston Leonard Spencer-Churchill was a British politician, army officer, and writer, who was Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955. As Prime Minister, Churchill led Britain to victory in the Second World War. Churchill represented five constituencies during his career as Member of Parliament (MP). Ideologically an economic liberal and British imperialist, he began and ended his parliamentary career as a member of the Conservative Party, which he led from 1940 to 1955, but for twenty years from 1904 he was a prominent member of the Liberal Party.

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1876

Battle of the Little Bighorn and the death of Lieutenant Colonel George Armstrong Custer. The Battle of the Little Bighorn, known to the Lakota and other Plains Indians as the Battle of the Greasy Grass and also commonly referred to as Custer's Last Stand, was an armed engagement between combined forces of the Lakota, Northern Cheyenne, and Arapaho tribes and the 7th Cavalry Regiment of the United States Army. The battle, which resulted in the defeat of US forces, was the most significant action of the Great Sioux War of 1876. It took place on June 25–26, 1876, along the Little Bighorn River in the Crow Indian Reservation in southeastern Montana Territory. Battle of the Little Bighorn and the death of Lieutenant Colonel George Armstrong Custer. The Battle of the Little Bighorn, known to the Lakota and other Plains Indians as the Battle of the Greasy Grass and also commonly referred to as Custer's Last Stand, was an armed engagement between combined forces of the Lakota, Northern Cheyenne, and Arapaho tribes and the 7th Cavalry Regiment of the United States Army. The battle, which resulted in the defeat of US forces, was the most significant action of the Great Sioux War of 1876. It took place on June 25–26, 1876, along the Little Bighorn River in the Crow Indian Reservation in southeastern Montana Territory.

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1877

Queen Victoria of the United Kingdom is proclaimed Empress of India. Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India. Queen Victoria of the United Kingdom is proclaimed Empress of India. Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death. On 1 May 1876, she adopted the additional title of Empress of India.

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1879

Using a filament of carbonized thread, Thomas Edison tests the first practical electric incandescent light bulb (it lasted 13½ hours before burning out). Carbon is a chemical element with symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Three isotopes occur naturally, 12C and 13C being stable, while 14C is a radionuclide, decaying with a half-life of about 5,730 years. Carbon is one of the few elements known since antiquity. Using a filament of carbonized thread, Thomas Edison tests the first practical electric incandescent light bulb (it lasted 13½ hours before burning out). Carbon is a chemical element with symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Three isotopes occur naturally, 12C and 13C being stable, while 14C is a radionuclide, decaying with a half-life of about 5,730 years. Carbon is one of the few elements known since antiquity.

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