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.

             

Isotopes: - 

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