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Which carbon isotope is most abundant in nature?
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isotope
An overview of isotopes.
The most abundant carbon isotope in nature is carbon-12, which accounts for approximately 98.93 percent of all naturally occurring carbon.1
Carbon-12 is a stable isotope and serves as the standard for measurements of atomic weight. The remaining portion of natural carbon consists primarily of the stable isotope carbon-13 (about 1.07 percent), along with trace amounts of the radioactive isotope carbon-14.21