carbon-12

carbon 12

noun
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-buhn-twelv] .


Origin:
1940–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
carbon 12  
A stable isotope of carbon, having six protons and six neutrons in the nucleus. Carbon 12 makes up most naturally occurring carbon.
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