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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.
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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Word History and Origins
Origin of carbon 121
First recorded in 1940–45
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