Which statement best describes what happens to the energy of the particles when water vapor begins to cool? A. The average potential energy decreases.

B. The average kinetic energy decreases.

C. The average potential energy remains the same.

D. The average kinetic energy remains the same.

B. The average kinetic energy decreases

When water vapor cools, it condenses. It is a phase change where water changes from a gas to a liquid. Condensation is the opposite of evaporation. In the atmosphere, moisture condenses to form clouds at higher levels. When it condenses near the surface, fog forms.
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☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts