Question

what is the name of this nuclide?
$_{2}^{4}he$
alpha
positron
gamma
neutron
beta

Explanation:

The nuclide $\frac{4}{2}He$ is an alpha - particle. An alpha - particle consists of 2 protons and 2 neutrons, which is what $\frac{4}{2}He$ represents where the mass number is 4 and the atomic number is 2. The other options (positron, gamma, neutron, beta) are different types of particles or forms of radiation not related to this specific nuclide.

Answer:

A. alpha