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Which of the following forms of hydrogen emits low energy β particles? (1) Deuterium ²H (2) Tritium ³H (3) Protium ¹H (4) Proton H⁺

1. Deuterium ²H
2. Tritium ³H
3. Protium ¹H
4. Proton H⁺

Correct answer: Tritium ³H

Solution

Tritium (³H) is a radioactive isotope of hydrogen that undergoes beta decay, emitting low energy beta particles, while deuterium and protium are stable isotopes and do not emit beta particles.

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