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The 3 particles of an atom are Proton (which has a positive charge), Neutron, and Electron (Which has a negative charge)
There are three main particles of an atom. 

These are Proton, Neutron and Electron. Protons and Neutrons are in the nucleus of an atom and Electrons are moving around the atom's nucleus. Proton's electrical charge is +1 (positive) . Neutron's electrical charge is neutral and Electron's electrical charge is -1 (negative).