Alpha particles are
$2$ free protons
doubly ionised helium atoms
helium atoms
singly ionised helium atoms
After one $\alpha $ and two $\beta $ emissions
A deutron is bombarded on $_8{O^{16}}$ nucleus and $\alpha$-particle is emitted. The product nucleus is
A radioactive nucleus emits a beta particle. The parent and daughter nuclei are
The $\alpha$-particle is the nucleus of an atom of
A radioactive nucleus $_{92}{X^{235}}$decays to $_{91}{Y^{231}}$. Which of the following particles are emitted