The term "charged particle" may refer to an ion, an electron, a proton, a positron, an alpha particle, an atomic nucleus that contains no electrons or another particle carrying a positive or negative charge. For example, a proton carries a charge of +1, while an electron has a -1 charge.
An ion is a type of charged particle where either an atom or a compound molecule carries a charge. For example, a hydrogen ion carries a charge of +1. Plasma, the fourth state of matter, is a collection of charged particles. A charged particle composed of two neutrons and two protons is known as an alpha particle.