Isotopes are variations of an element with different neutron numbers. Neutrons' addition or subtraction can change the atomic mass, forming new isotopes.
Isotopes are different forms of an element with the same number of protons but different numbers of neutrons. Some isotopes may be radioactive, emitting particles to achieve stability. When neutrons are added or subtracted from an atom, it alters the atomic mass of the atom, forming isotopes with varying mass numbers.
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