Question

After losing two electrons, an atom of Helium becomes equivalent to

• A. $\alpha$ -particle
• B. $\beta$ -particle
• C. $\gamma$ -particle
• D. Deuterium nucleus

Answer 1

The correct option is A $\alpha$ -particle

${}_2^{4}He{\to }_2^{4}H{e}^{+2}+2e^{-}$

${}_2^{4}H{e}^{+2}$ is alpha particle. Because it has charge equal to +2e and mass is four times the mass of one proton.