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The hydrogen isotope having one proton and no neutron is:
AProtium
BDeuterium
CTritium
DYttrium
Answer & Solution
Correct answer: A. Protium
1. This is by far the commonest hydrogen isotope.
2. The isotope with only one proton is called protium.
3. So the correct answer is protium.
_Source: syllabus Chemistry, Ch 2 'Structure of Atom'_
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