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  4. The sum of number of protons, electrons and neutrons in the heaviest isotope of hydrogen is

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Q. The sum of number of protons, electrons and neutrons in the heaviest isotope of hydrogen is _____

Hydrogen

Solution:

The heaviest isotope of hydrogen is tritium i.e., ${ }_{1}^{3} H$ which has $3$ nucleons ($1$ proton $+2$ neutrons) and one electron so sum of these is $3+1=4$.