Name the three subatomic particles of an atom.

Electron: It is negatively charged with one unit negative. The mass of an electron is considered to be negligible.

Proton: Proton has a charge, equal in magnitude but opposite in sign to that of the electron. Its mass is considered to be approximately 2000 times as that of the electron.

Neutron: Neutrons are present in the nucleus of all atoms, except hydrogen. It is subatomic particle which had no charge and a mass nearly equal to that of a proton.