Question

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Answer 1

Atomic number is the number of electrons present in an atom

Isobars are two types of same element having different atomic number but same atomic mass

Isotopes have same atomic number but different atomic mass

Answer 2

Atomic No- A.N of an element is the no of protons present in the nuclear of an atom of that element.
Isobars- Isobars are the atoms of different elements having same atomic mass(no of protons+no of neutrons) but different atomic no
eg: Ca(atomic mass 40) and argon (atomic mass 40) are different elements having atomic mass
Isotops: Isotops are atoms of same element having same atomic no but different mass no
eg: protium(Hydrogen having mass no 1),
Duterium(". ". ". no 2)
Tritium (. ". ". ". no 3)