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The number of nucleons in the isotope of an atom ${}_{Z}X^{m}$ are

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m+Z

m-Z

answer is D.

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Detailed Solution

m-Z : In the isotope of an atom ${}_{Z}X^{m}$ the letter “Z” represents atomic number or total no. of protons whereas the letter “m” indicates mass number or total no. of nucleons (protons and neutrons)

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