A) Same mass number but different neutrons
B) Same atomic number but different neutrons
C) Same atomic number, mass number and neutrons
D) Different atomic and mass number but same neutrons
Correct Answer: D
Solution :
Isotones have the same number of neutrons but different number of nucleons \[(n+p)\]. e.g., \[_{18}^{39}Ar,\,_{19}^{40}K\].
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