The number of neutrons in the most common isotope of hydrogen is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 0
The most common isotope of hydrogen is protium (¹H or hydrogen-1), which has:
- 1 proton
- 0 neutrons
- 1 electron
It accounts for over 99.98% of naturally occurring hydrogen.
The other isotopes are deuterium (¹H₂, 1 neutron, rare) and tritium (¹H₃, 2 neutrons, trace and radioactive).
Thus, the number of neutrons in the most common isotope is 0.