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What is atomic number nucleons and m...

What is atomic number nucleons and mass number ? Give relation between them.

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Atomic number (Z ) : The number of protons presents in the nucleus is equal to atomic number (Z ) . Which are equal number of electrons in a neutral atom .
Nucleons : protons and neutrons present in the nucleus are collectively known as nucleons
Mass Number : The total number of nucleons in termed as mass number (A ) of the atom.
mass number (A ) = (Number of ) + ( Number of )
(protons (z ) + neutrons (n))
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