The mass number of an atom is equal to
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The mass number of an atom is equal to the total number of protons and neutrons in its nucleus. The mass number is represented by the letter A
The mass of an atom is the sum of number of protons and number of neutrons present in that atom in atomic mass unit . The total number of protons and neutrons present in a nucleus is termed as nucleon. Therefore, the mass of an atom is equal to the number of nucleons in atomic mass unit