Atomic number, Mass number, Isobars and Isotopes

Atomic number (Z)= no of protons in the nucleus of an atom
                                       = no of electrons in a neutral atom
Mass number (A) = number of protons (z) + number of electron (n)

Isobars:- 

              These are atoms with same mass number but different atomic number.

             

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Isotopes: – 

               These are atoms with same atomic number but  different atomic mass no.
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