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Isotope(s) of hydrogen which emits low energy β^- particles with t½ value > 12 years is/are 

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Isotope(s) of hydrogen which emits low energy β- particles with t½ value > 12 years is/are 

(1) Protium 

(2) Tritium 

(3) Deuterium 

(4) Deuterium and Tritium

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2 Answers

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Answer is (2) Tritium 

11H and 12H are stable while 31H is radioactive.

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Tritium isotope of hydrogen is radioactive and emits low energy β− particles. It is because of high n/p ratio of tritium which makes nucleus unstable

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