+Isotopes are variants of an [Atom](/wiki/atom) from the same [Element](/wiki/element). They possess an identical number of protons but differ in their count of [Neutron](/wiki/neutron)s, leading to unique atomic masses.
+## See also
+- [Atomic Number](/wiki/atomic_number)
+- [Mass Number](/wiki/mass_number)
+- [Radioactivity](/wiki/radioactivity)
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