Isotopes of an element have the same number of protons (and thus the same atomic number and chemical properties) but differ in the number of neutrons in their nucleus. The mass number (A) of an atom is the sum of protons and neutrons (A = Z + N). Since isotopes of an element have the same Z but different N, they will have different mass numbers and thus different masses.
What are isotopes?
Asked in TNPSC CS Prelims 2021 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
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Answer: A. Atoms have same number of protons but different number of neutrons
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