Which of the following is NOT one of the three states of matter?

The classification of matter is traditionally based on three common states: solid, liquid, and gas. Each of these states has distinct characteristics, such as shape, volume, and molecular arrangement.

In solids, particles are tightly packed together, giving them a definite shape and volume. Liquids, on the other hand, have a definite volume but can take the shape of their container due to the more loosely arranged particles. Gases have neither a definite shape nor a definite volume, as their particles are spread out and move freely to fill any available space.

Plasma, while a recognized state of matter, is not one of the three classical states (solid, liquid, gas) typically referred to in introductory discussions about matter. Plasma consists of charged particles and is commonly found in stars and neon signs.

Therefore, the choice representing plasma is not one of the three fundamental states of matter typically taught, highlighting the common framework of solids, liquids, and gases when discussing the states of matter in a foundational chemistry context.