Question

Which is the correct statement about $\alpha$-particle?

• A. Proton is nucleus of deuterium
• B. Proton is ionized hydrogen molecule
• C. Proton is ionized hydrogen atom
• D. Proton is α-particle

Answer 1

The correct option is D

Proton is α-particle

An alpha-particle has 2 protons and 2 neutrons.

The proton is the ionized hydrogen atom.

Why is it not ionized hydrogen molecule? Because ionized hydrogen molecule will be

${H_2}^{+}$$\to$1 electron, 2 protons

$\Rightarrow$ Deuterium $\to$ Mass no. = 2, Atomic Number = 1 Nucleus of Deuterium $\to$ 1 proton + 1 neutron

$\Rightarrow$ $\alpha$ - particle is the nucleus of Helium which carry 2 protons and 2 neutrons.