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Which elements have the most isotopes?

These two elements are rich in isotopes.

Isotopes are elements that share an atomic number, but differ in number of neutrons. [©Shutterstock, 2010]
©Shutterstock, 2010
Isotopes are elements that share an atomic number, but differ in number of neutrons.

The elements with the most isotopes - 36 each - are xenon (Xe), with 9 stable isotopes (identified from 1920 to 1922) and 27 radioactive isotopes (identified from 1939 to 1981); and cesium (Cs), with 1 stable isotope (identified in 1921) and 35 radioactive isotopes (identified from 1935 to 1983).

The element with the least number of isotopes is hydrogen (H), with 3 isotopes. Hydrogen's isotopes include 2 stable ones, protium (identified in 1920) and deuterium (identified in 1931);and 1 radioactive one, tritium (first identified in 1934, but not classified as a radioactive isotope until 1939).

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