1.They have the same element and same number.
2. One or two or more atoms having the same atomic number of different mass numbers
3. Isotopes are any of the several different forms of an element each having different atomic mass (mass number). Isotopes of an element have nuclei with the same number of protons (the same atomic number) but different numbers of neutrons. Therefore, isotopes have different mass numbers, which give the total number of nucleons—the number of protons plus neutrons.
4. It is the number of particles in one mole of a given substance. used to convert units.
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