Here's why:

* Beta particles are high-energy electrons or positrons emitted from the nucleus during radioactive decay.

* Electrons are fundamental particles with a negative charge, found orbiting the nucleus of an atom.

* Alpha particles are made up of two protons and two neutrons, essentially the nucleus of a helium atom.

* Helium is a noble gas with two protons and two neutrons in its nucleus.

So, both beta particles and electrons are related to the electron, and alpha particles and helium are related to the helium atom.