CHARGED PARTICLE

In physics, a 'charged particle' is a particle with an electric charge. It may be either a subatomic particle or an ion. A collection of charged particles, or even a gas containing a proportion of charged particles, is called a plasma, which is called the ''fourth state of matter'' because its properties are quite different from solids, liquids and gases. Particles either have a positive, negative or no charge (being neutral).
Their effects go beyond the laboratory though: see aurora borealis