Carbon-13

Carbon-13, ¹³C

General
Symbol	13C
Names	carbon-13, 13C, C-13
Protons (Z)	6
Neutrons (N)	7
Nuclide data
Natural abundance	1.109%
Isotope mass	13.003355[1] Da
Spin	−⁠1/2⁠
Isotopes of carbon Complete table of nuclides

Carbon-13 (¹³C) is a natural, stable isotope of carbon with a nucleus containing six protons and seven neutrons. As one of the environmental isotopes, it makes up about 1.1% of all natural carbon on Earth.