atomic number 6

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Noun

1.

atomic number 6 - an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds carbon, C fullerene - a form of carbon having a large molecule consisting of an empty cage of sixty or more carbon atoms chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter carbon 14, radiocarbon - a radioactive isotope of carbon char - a charred substance charcoal, wood coal - a carbonaceous material obtained by heating wood or other organic matter in the absence of air carbon black, crock, lampblack, smut, soot - a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink activated carbon, activated charcoal - powdered or granular carbon used for purifying by adsorption; given orally (as a slurry) it is an antidote for some kinds of poisons black lead, graphite, plumbago - used as a lubricant and as a moderator in nuclear reactors coal - fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period adamant, diamond - very hard native crystalline carbon valued as a gem limestone - a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals crude, crude oil, fossil oil, petroleum, rock oil, oil - a dark oil consisting mainly of hydrocarbons