Zinc has five stable isotopes, tabulated along with their natural abundances below:
The isotopic composition of Zn is reported in delta notation (in ‰):
where Zn is a Zn isotope other than Zn (commonly either Zn or Zn). Standard reference materials used for Zn isotope measurements are JMC 3-0749C, NIST-SRM 683 or NIST-SRM 682.