During which changes of state does the motion of the atoms decrease? melting and deposition freezing and condensation condensation and evaporation vaporization and sublimation

That would be freezing and condensation. As the temperature decreases the motion of the atoms decrease.

freezing and condensation

Explanation:

According to the kinetic theory of matter, the particles of a body are in constant motion. However, the motion of these particles depend on which state of matter the substance is in.

In the gaseous state, there is minimal interaction of gas particles hence they have very high kinetic energy and move about freely. When the gas condenses to liquid, intermolecular interactions become appreciable and the motion of the particles decrease.

In a solid, the particles are held in fixed positions. They can only vibrate about their mean positions. Hence when a liquid freezes, particle motion in highly decreased. Hence the answer.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.