Question

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

• A. 6
• B. 5
• C. 4
• D. 3

Answer 1

Answer: (C)

4

Answer 2

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