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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