Answer:
A) Alpha particle
Explanation:
An alpha particle is identical to a helium nucleus, since consists of 2 protons and 2 neutrons.
The charge of an alpha particle is +2e and its mass is 4 a.m.u.
Alpha particles are produced in alpha decays. Alpha decays occur when a nucleus emits an alpha particle: as a result, the atomic number of the nucleus decreases by 2 units, while its mass number decays by 4 units.
The equation that represents an alpha decay is
[tex]_Z^AX \rightarrow _{Z-2}^{A-4}Y+_2^4 \alpha[/tex]
