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easyQ. No. 15077-which-of-the-following-is-not-an-isotope-of-hydrogen

Which of the following is NOT an isotope of hydrogen?

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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.

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