carbon 12
noun Date: 1946 an isotope of carbon of mass number 12 that is the most abundant carbon isotope and is used as a standard for measurements of atomic weight

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Carbon-12 — Infobox isotope alternate names =carbon 12 isotope symbol =C mass number =12 mass =12 num neutrons =6 num protons =6 abundance =98.89% halflife = error halflife = background =#f99 text color = decay product = decay symbol = decay mass = decay… …   Wikipedia

  • carbon 12 — noun : an isotope of carbon of mass number 12 that is the most abundant carbon isotope * * * the isotopic carbon atom that comprises 99 percent of naturally occurring carbon, and that since 1961 has been used as the standard for atomic weight by… …   Useful english dictionary

  • carbon 12 — the isotopic carbon atom that comprises 99 percent of naturally occurring carbon, and that since 1961 has been used as the standard for atomic weight by representing a unit of 12.00000. Also, carbon 12 /kahr beuhn twelv /. [1940 45] * * * …   Universalium

  • carbon 12 — or carbon 12 n. chem. the isotopic carbon atom used as the standard for atomic weight • Etymology: 1940–45 …   From formal English to slang

  • carbon-12 — carˈbon 12 noun An isotope of carbon with a mass of 12, used as a standard in determining relative atomic and molecular weight • • • Main Entry: ↑carbon …   Useful english dictionary

  • carbon-12 — noun The most abundant of the two stable isotopes of carbon, , having six protons and six neutrons; it is the standard for atomic weight and is used to define the mole. See Also: carbon 13, carbon 14 …   Wiktionary

  • carbon-12 — noun the commonest natural carbon isotope, of mass 12, which is the basis for the accepted scale of atomic mass units …   English new terms dictionary

  • carbon-12 — The standard of atomic mass, 98.90% of natural carbon …   Medical dictionary

  • Carbon label — is a form of isotopic labeling where a carbon 12 atom has been replaced with either a carbon 13 atom or a carbon 14 atom in a chemical compound so as to tag (i.e. label) that position of the compound to assist in determining the way a chemical… …   Wikipedia

  • carbon dating — ► NOUN ▪ the determination of the age of an organic object from the relative proportions of the isotopes carbon 12 and carbon 14 that it contains …   English terms dictionary

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