Radioactive elements emit \( \alpha, \beta \) and \( \gamma \)-rays...

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Radioactive elements emit \( \alpha, \beta \) and \( \gamma \)-rays and are characterised by their half-lives. The mass number of radioactive isotope of hydrogen is
(a) 2
(b) 1
(c) 3
(d) 0
\( \mathrm{P} \)
W
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