Q. The sum of protons, electrons and neutrons in the heaviest isotope of hydrogen is
A) 3
B) 5
C) 4
D) 6
Explanation
(c)
$\ _{1}H^{3}\ has\ 3\ nucleons\ (1\ proton + 2\ neutrons)$ and one electron, so sum of these is $3 + 1 = 4$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.