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

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

Hydrogen

Solution:

The heaviest isotope of hydrogen is tritium ${ }_{1} T ^{3}$ with atomic number 1 and mass number 3 . It contains 1 electron, 1 proton and 2 neutrons. The sum is $1+1+2=4$.