the sum of protons and neutrons present in the nucleus.
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B
the number of protons in the nucleus.
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C
the number of neutrons in the nucleus.
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D
the sum of protons, neutrons and electrons present in the nucleus.
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Solution
The correct option is A the sum of protons and neutrons present in the nucleus. A nucleon is one of either of the two types of subatomic particles (neutrons and protons) which are located in the nucleus of atoms. Only option A correct .