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
- CNumber of both protons and neutrons is same
- DNumber of both protons and neutrons is different
Show answer and explanation
Correct answer: (b) Number of protons is same but number of neutrons is different
Explanation
Isotopes are atoms of the same element with the same number of protons (atomic number) but a different number of neutrons, and so a different mass number.
For example, carbon-12 and carbon-14 both have 6 protons, with 6 and 8 neutrons. Atoms with the same mass number but different atomic numbers are isobars.