Why is carbon 12 the reference isotope?
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In 1961 the isotope carbon-12 was selected to replace oxygen as the standard relative to which the atomic weights of all the other elements are measured. In 1980 the CIPM clarified the above definition, defining that the carbon-12 atoms are unbound and in their ground state.
Name, symbol: Carbon,12C
Isotope mass: 12 u
Parent isotopes: 12N; 12B
Neutrons: 6
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