Nucleons are equal to :

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(D) Nucleons are defined as the total number of protons and neutrons present in the nucleus of an atom.For an atom or isotope represented as $^A_Z X$:

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Number of protons and neutrons in the nucleus

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(D) Nucleons are defined as the total number of protons and neutrons present in the nucleus of an atom.For an atom or isotope represented as $^A_Z X$:$Z$ is the atomic number (number of protons).$A$ is the mass number (number of nucleons).$A - Z$ gives the number of neutrons.Therefore,the total number of nucleons is equal to the sum of the number of protons and the number of neutrons,i.e.,$A = 	ext{protons} + 	ext{neutrons}$.

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