What is the sum of protons, electrons and neutrons in the heaviest isotope of hydrogen?

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Solution

The heaviest isotope of hydrogen is tritium $31 H$ . This has 1 proton and 1 electron as this is an isotope of hydrogen. Remember, isotopes just have a different number of neutrons, the number of electrons and protons remain the same. The number of neutrons is 2 here. So, the answer would be 4.

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