Two atoms are said to be isobars if:

Chemistry Structure of Atom NCERT Examplar Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 11, 2026

They have same atomic number but different mass number

They have same number of electrons but different number of neutrons

They have same number of neutrons but different number of electrons

Sum of the number of protons and neutrons is same but the number of protons is different

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The correct answer is:

Isobars have the same mass number (i.e., sum of protons and neutrons) but different atomic number (i.e., number of protons), e.g., and are isobars.

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