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Q.

The sum of the number of protons and neutrons present in the nucleus of an atom is known as [[1]].

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answer is MASS NUMBER .

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Detailed Solution

Mass number can be defined as the sum of the number of protons and neutrons present in the nucleus of an atom. Protons and neutrons are present in the nucleus of an atom and they constitute the mass of the atom. 

 

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The sum of the number of protons and neutrons present in the nucleus of an atom is known as [[1]].