alleryProtium, deuterium and tritium are all forms (isotopes) of which element?
AHelium
BNitrogen
CCarbon
DHydrogen
Answer & Solution
Correct answer: D. Hydrogen
1. Isotopes are atoms of the same element with different numbers of neutrons.
2. Protium, deuterium and tritium each have one proton.
3. An atom with one proton is hydrogen, so they are isotopes of hydrogen.
_Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.35._
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