Which element has the greatest number of naturally occurring isotopes?

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What are isotopes and how do they work? — isotope An overview of isotopes.

The element with the greatest number of naturally occurring isotopes is tin (Sn), which possesses 10 stable isotopes.12

While most chemical elements have at least two isotopes, the number of naturally occurring isotopic forms ranges from one, such as in fluorine, to as many as ten for tin. These isotopes are defined by having the same atomic number but different numbers of neutrons in their nuclei, resulting in different atomic masses.23