How would you describe the movement of atoms in a solid, liquid and gas?

The three different states of matter are solid, liquid, and gas. Based on how well-matched their constituent atoms are to one another, they may be distinguished from one another.
A solid has the most affinity, resulting in closely packed atoms, a liquid has a lesser affinity than a solid, allowing it to flow, and gases have the lowest affinity.

We'll think about what each of these phrases means before concentrating on how the atoms or particles travel in the various states of matter.
When it comes to solids, we are aware that solids are made up of tightly packed particles or atoms and are not fluids. In other words, the atoms or molecules inside the structure are immobile due to the form's dense packing. These come in crystal and amorphous varieties. The solids have specific volume and shape. An example would be a log of wood.

When we think of a liquid, the particles are not as closely packed as they are in a solid state of matter. The particles have a certain level of affinity for one another, which gives them a defined volume. The liquids take on the shape of the container they are stored in since they are fluid, which means they may flow. As a result, they don't have a set shape. Taking water in a bottle as an example.

Consider the gas, where particles have the least affinities for one another and travel very quickly. They lack a clear form or volume. It occupies the whole capacity of the storage container. In other words, it has a tendency to disperse and adopt the form of the container. for instance, a tank of helium gas.

Hence, the correct option is (A).