What Is Carbon?
QUICK ANSWER
Carbon is a chemical element with atomic number 6 and the symbol C. It is the fourth most abundant element in the universe and the basis of all known life on Earth. Carbon's ability to bond with itself in long chains and rings is what makes the chemistry of life and most modern materials possible.
Carbon is one of the most versatile elements on the periodic table. The same element that makes up coal also makes up diamonds, graphite, graphene, and every living thing on Earth. Carbon's unique chemistry, with four bonding sites allowing complex molecular structures, is what made life possible and what makes most modern materials work.
Where is carbon on the periodic table?
Carbon has atomic number 6, the symbol C, and sits in group 14 alongside silicon, germanium, tin, and lead. It is a non-metal with four electrons in its outer shell, which lets it form four covalent bonds at once. This bonding capacity is what allows carbon to make millions of different compounds, more than any other element. Two stable isotopes exist (C-12 and C-13), plus the radioactive C-14 used in dating ancient materials. Carbon has the highest melting point of any element at over 3,500°C in its diamond form.
What are the forms of carbon?
Pure carbon exists in several allotropes with very different properties. Diamond has each carbon atom bonded to four others in a tetrahedral structure, making it the hardest natural material. Graphite has carbon arranged in stacked sheets that slide past each other easily, which is why pencils write. Graphene is a single sheet of graphite-style carbon, extremely strong and electrically conductive. Fullerenes (like buckminsterfullerene, the C60 buckyball) are carbon arranged in hollow spheres. Carbon nanotubes are rolled-up graphene cylinders with remarkable strength and electrical properties.
What is carbon used for?
Carbon's industrial uses are enormous. Steel is iron with controlled amounts of carbon, ranging from less than 0.1% in mild steel to about 1% in tool steel. Coal is carbon-rich rock used for power generation and steel production. Graphite is used in pencils, electrodes, and lubricants. Activated charcoal filters water and air by adsorbing impurities. Carbon fiber composites build aircraft, bicycles, and sporting equipment, lighter and stronger than steel. Synthetic diamonds are made by compressing carbon under high pressure for industrial cutting tools.
Why is carbon essential to life?
All known life on Earth is built on carbon-based molecules. Proteins, DNA, sugars, fats, and almost every biological molecule have carbon backbones. Carbon's ability to form four bonds simultaneously, including bonds with itself, lets life build the long chains and complex rings needed for biological structures. Carbon also bonds easily with hydrogen, oxygen, nitrogen, and other essential elements, which is why organic chemistry (the study of carbon compounds) exists as its own enormous field. No other element comes close to carbon's combination of bond strength and versatility.
Carbon is the most versatile element on the periodic table. The same atom can be a diamond, a pencil lead, a strand of DNA, or a sheet of graphene. Every living thing depends on carbon chemistry, and so does much of modern technology, making it arguably the most important element of all.
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