• question_answer The sum of protons, electrons and neutrons in the heaviest isotope of hydrogen is A) 6 B) 5 C) 4 D) 3

Correct Answer: C

Solution :

$_{1}{{H}^{3}}$ has 3 nucleons (1 proton + 2 neutrons) and one electron so sum of these is 3 + 1 = 4.

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