Plasma is the mixture of:A. Electrons and protons only.B. Electrons and positive ions.C. Electrons and beta two particles.D. Neutrons and protons

The correct answer is B. Electrons and positive ions.

Plasma is often referred to as the fourth state of matter, distinct from solids, liquids, and gases. It consists of a collection of free-moving electrons and ions - atoms that have lost electrons. Energy is needed to strip electrons from atoms to make plasma. The energy can be of various origins: thermal, electrical, or light (ultraviolet light or intense visible light from a laser). With sufficient energy, the electron is freed from the nucleus, leaving a positively charged ion behind.