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|Which of the following is NOT an isotope of hydrogen?

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

Which of the following is NOT an isotope of hydrogen?

Last Updated: 28 Jun 2026

AHelium-3 (³He)

BProtium (¹H)

CDeuterium (²H)

DTritium (³H)

Correct Answer: Helium-3 (³He)Your Answer: A

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Explanation

The correct answer is Option A — Helium-3 (³He). Helium-3 is an isotope of HELIUM, NOT hydrogen. The three isotopes of hydrogen are:

Protium (¹H) - most common, no neutron
2. Deuterium (²H or D) - has 1 neutron, used in heavy water
3. 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.

Important Notes

all with atomic number 1 (one proton). Option A — Protium (¹H) is incorrect as a 'not an isotope' answer — it IS a hydrogen isotope. Protium is the most common form of hydrogen

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Answer

Helium-3 (³He)

Exam Info

Asked in: SSC, Railway, Banking and other competitive exams.
Also asked in: RRB NTPC, CHSL, State PCS and online mock tests.
Topic: Modern Physics

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