A) hydrogen
B) titanium
C) tantalum
D) tellurium
Correct Answer: A
Solution :
Hydrogen has three isotopes and these are protium\[{{(}_{1}}{{H}^{1}})\], deuterium\[{{(}_{1}}{{H}^{2}})\]and tritium\[{{(}_{1}}{{H}^{3}})\].
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