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

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What is the sum of protons, electrons and neutrons in the heaviest isotope of hydrogen?
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Correct Answer - 4
Tritium `T` or `._(1)^(3)H` the heaviest isotope of hydrogen has `1` proton, `2` neutrons and `1` electrons. Hence sum total of proton, neutron and electron is `4`.
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