the sum of the masses of protons and electrons present in the nucleus.
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B
equal to the mass of neutrons in the nucleus.
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C
the sum of the masses of protons and neutrons present in the nucleus.
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D
none of the above.
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Solution
The correct option is C the sum of the masses of protons and neutrons present in the nucleus. The mass of an atom is given by the sum of the masses of protons and neutrons present in the nucleus.