What is Mass number??
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Explanation:
mass number is the atomic mass of an atom
it us the sum total of all the neutrons and protons present in an atom
the whole mass of an atom resides in its nucleus
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Mass Number: The sum total of the masses of all the nucleons present in the nucleus of an aton i.e, No . of Protons + No. of Neutrons is called Mass Number.
Example: Sodium atom has 11 protons and 12 neutrons in its nucleus , therefore, its mass number is (11+12)=23.
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