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Q. 8.     Explain with examples

    (ii)     Mass number,

Answers (1)

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Mass Number :

Mass number of an atom is the sum total of the masses of all the nucleons present in the nucleus of an atom, i.e.,
Mass Number = No. of Protons + No. of Neutrons

It is denoted by A.


Example: As a sodium atom has 11 protons and 12 neutrons in its nucleus,

               So, it's mass number = 11 + 12 = 23.

Posted by

Pankaj Sanodiya

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