Multiple choice general knowledge math & puzzles

DEUTERIUM IS _______ .

  1. HYDROGEN ATOM WITH EXTRA PROTON

  2. HYDROGEN ATOM WITH EXTRA NEUTRON

  3. HELIUM ATOM WITH ONE PROTON REMOVED

  4. HELIUM ATOM WITH ONE NEUTRON REMOVED

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Deuterium is an isotope of hydrogen. While a standard hydrogen atom (protium) has one proton and no neutrons, deuterium contains one proton and one neutron, effectively adding an 'extra' neutron to the nucleus.