Changing the mass number without changing the element (isotopes).
The atomic number of an element will never change because it serves as the element's identity. The number of protons in the nucleus is known as the atomic number, if one more proton is added, the element is changed. An element's atomic number will never change as a result. However, the atomic mass can alter, and we refer to these as isotopes. The total mass of the protons and neutrons in the nucleus is known as the atomic mass number, and because an isotope has more neutrons than protons, its mass is greater than that of stable nuclei.
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