According to the kinetic theory, what is true about atoms?

The kinetic theory of matter posits that all matter is composed of tiny particles, including atoms, and these particles are in a constant state of motion. This idea applies to solids, liquids, and gases, indicating that temperature is directly related to the energy of the motion of these particles. As temperature increases, the motion of the atoms also increases. This understanding is fundamental to descriptions of the states of matter and their behaviors under different conditions.

The motion of atoms is not limited to specific states (like only in liquids) or restricted in frequency—as implied by other options—because they continuously vibrate or move even when in a solid state. Thus, the assertion that atoms are always in motion accurately reflects the principles of kinetic theory, confirming that it is valid for all forms of matter.