Well, for atoms to stop moving, the temperature would have to be at 0 K, aka absolute zero. However, that's theoretically impossible. Anyway, solid molecules barely move, "vibrating" against each...
Solids - the particles are close together Liquids - In a non-uniform and non-static, close-packed manner. Gases - they float around the space they are in
The particles in a gas move faster and are full of energy. However the particles in a solid do not have as much energy and vibrate in place
-Baarkullah Awan