Science
easyQ. No. 15077
Which of the following is NOT an isotope of hydrogen?
Last Updated:
AHelium-3 (³He)
BProtium (¹H)
CDeuterium (²H)
DTritium (³H)
Correct Answer: Helium-3 (³He)Your Answer: A
Explanation
The correct answer is Option A — Helium-3 (³He). Helium-3 is an isotope of HELIUM, NOT hydrogen. Protium (¹H) - most common, no neutron Deuterium (²H or D) - has 1 neutron, used in heavy water Tritium (³H or T) - has 2 neutrons, radioactive Why other options are wrong: Option B (Protium): IS an isotope of hydrogen with mass number 1. Option C (Deuterium): IS an isotope of hydrogen with mass number 2. Option D (Tritium): IS an isotope of hydrogen with mass number 3.