Tritium, a radioactive isotope of hydrogen, emits which of the following particles ?

The correct option is Beta (β⁻).

Step-by-step Explanation:

1. Tritium ($H_1^3$ or T) is a radioactive isotope of hydrogen. Its nucleus contains 1 proton and 2 neutrons.
2. Due to the excess of neutrons, tritium is unstable and undergoes radioactive decay to reach a more stable state.
3. Specifically, tritium undergoes beta-minus (β⁻) decay. In this process, one of the neutrons in the tritium nucleus transforms into a proton, an electron (beta particle), and an electron antineutrino:
$n\to p+e^{-}+\overline{{\nu }_e}$

4. As a result of this decay, tritium transforms into Helium-3 (${\mathrm{He}}_2^3$), releasing a beta-minus particle (electron) in the process:
$H_1^3\to {\mathrm{He}}_2^3+{\beta }^{-}+\overline{{\nu }_e}$

Therefore, tritium emits beta-minus (β⁻) particles.