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"coal") is a chemical element with symbol C and atomic number 6.

In general, covalent radius decreases with lower coordination number and higher bond order.Carbon forms a vast number of compounds, more than any other element, with almost ten million compounds described to date, The allotropes of carbon include graphite, one of the softest known substances, and diamond, the hardest naturally occurring substance.It bonds readily with other small atoms including other carbon atoms, and is capable of forming multiple stable covalent bonds with suitable, multivalent atoms.Carbon compounds form the basis of all known life on Earth, and the carbon-nitrogen cycle provides some of the energy produced by the Sun and other stars.Although it forms an extraordinary variety of compounds, most forms of carbon are comparatively unreactive under normal conditions.The system of carbon allotropes spans a range of extremes: Atomic carbon is a very short-lived species and, therefore, carbon is stabilized in various multi-atomic structures with different molecular configurations called allotropes.

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