The total number of protons only in the nucleus of an atom is called Atomic Number and denoted by “Z1”
The total sum of Protons and Neutrons in the nucleus of an atom is called Mass Number and denoted by ‘A’.
The number of atoms or ions or molecules or formula units present in 1 mole of a substance is called Avogadro’s Number and it is 6.02 x 10^23
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