What are the three subatomic particles of an atom?

Proton, neutron, and electron. The proton is positive, the neutron is neutral, and the election is negative.

Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter " P." Neutrons have no electrical charge.