Question:
Two atoms are said to be isobars if.
(i) they have the same atomic number but a different mass number.
(ii) they have the same number of electrons but a different number of neutrons.
(iii) they have the same number of neutrons but a different number of electrons.
(iv) the sum of the number of protons and neutrons is the same but the number of
protons is different.
Solution:
Option (iv) the sum of the number of protons and neutrons is the same but the number of
protons is different is the answer.