The term 'negative particle' refers to a type of particle with a negative charge. Electrons, muons, anions, and ions are all examples of negative particles. An ELECTRON is a subatomic particle with a negative charge that orbits the nucleus of an atom. A muon is a subatomic particle similar to an ELECTRON but with a much greater mass. An anion is an ION with a negative charge, and an ION is an atom or molecule with an electric charge due to the loss or gain of one or more electrons.