Question
Distinguish between isotopes and isobars.

Answer

IsotopesIsobars
The atoms of the same element with same atomic number (Z) but different mass number (A) are called isotopes.
e.g. ${ }_{17} Cl ^{35}{ }_{17} Cl ^{37}$
The atoms of the different element with the same mass number (A) but different atomic number (Z) are called isobars.
e.g. ${ }_{18} Ar ^{40}{ }_{20} Ca ^{40}$

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