A) isobars
B) isomers
C) isotones
D) isotopes
Correct Answer: D
Solution :
Isotopes have the same atomic number but different mass numbers \[eg,\,{{\,}_{1}}{{H}^{1}},\,{{\,}_{1}}{{H}^{2}},\,{{\,}_{1}}{{H}^{3}}\] are the isotopes of hydrogen.
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