Carbon is an  elementary substance. By nature it is non metallic. Carbon is present in all organic compounds. Carbon is combustible, and forms the base of lampblack and charcoal. Carbon is largely available as mineral coal. In its pure crystallized state Carbon constitutes the diamond, the hardest of known form of Carbon. Another form of Carbon  is graphite,  and it is soft. When united with oxygen it forms carbon dioxide and when united with hydrogen, it forms hydrocarbons. There are various compounds of hydrocarbons.
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