41st B.P.S.C. (Pre) 1996
Isotopes are that nuclei of atomic nucleus in which –
aNumber of neutrons is same but number of protons is different
bNumber of protons is same but number of neutrons is different✓ Correct
cNumber of both protons and neutrons is same
dNumber of both protons and neutrons is different
Explanation
See the explanation of the above question.
general-science