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why isotopes have different mass number?

Asked by 5th June 2008, 4:54 PM
Answered by Expert
Answer:

Isotopes are any of the 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

Answered by Expert 10th June 2008, 6:44 AM
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