A) polymers
B) isobars
C) isotopes
D) isomers
Correct Answer: C
Solution :
Atoms with identical atomic number but different atomic mass number are called isotopes, e.g.\[_{1}{{H}^{1}}{{,}_{1}}{{H}^{2}}\]and\[_{1}{{H}^{3}}\]are three isotopes of hydrogen.
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