Question

The diagrams below represent the four states of matter.

A number of blue balls are loosely packed in a container. A number of yellow balls are randomly distributed in a container.
Diagram 1 Diagram 2

A number of red balls are tightly and neatly packed in a container. A number of balls are positioned randomly in a container. Some are pink and labeled with a plus sign and some are blue and labeled with a minus sign.
Diagram 3 Diagram 4

Which diagram represents a gas that has been ionized?
diagram 1
diagram 2
diagram 3
diagram 4

Answer 1

Diagram 4 — it shows a randomly arranged gas with positive and negative charges (ions and electrons), i.e., an ionized gas (plasma).