Lightest isotope in the periodic table is:

tritium

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deuterium

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protium

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none of these

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Solution

The correct option is C protium

Lightest isotope in the periodic table is protium because it has only one proton and no neutron hence it has the mass number 1 and remaining deuterium and tritium is having the mass numbers 2,3 respectively.
Hence, option C is correct.

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