Illustrated Glossary of Organic Chemistry

Carbon-13 (¹³C): The carbon isotope whose nucleus contains six protons and seven neutrons. This gives an atomic mass of 13 amu.


The nucleus of carbon-12 contains six protons and six neutrons, resulting in an atomic mass of 12 amu.		The nucleus of carbon-13 contains six protons and seven neutrons, resulting in an atomic mass of 13 amu.		The nucleus of carbon-14 contains six protons and eight neutrons, resulting in an atomic mass of 14 amu.