In which state of matter are molecules typically closest together?

The state of matter in which molecules are typically closest together is solid. In solids, the molecules are tightly packed in a fixed arrangement, allowing very little space between them. This close proximity gives solids a definite shape and volume, as the intermolecular forces are strong enough to hold the molecules in place.

In contrast, liquids have molecules that are still close together but not in a fixed position, allowing them to flow and take the shape of their container. Gases have molecules that are far apart and move freely, occupying more space and having no definite shape or volume. Plasma consists of ionized gas particles with even more energy, causing them to spread out significantly. Thus, among all states of matter, solids have the closest arrangement of molecules.