What happens to particles in a solid when heat is applied? they move around more. they get closer together. they reduce in size. they stop moving.

c is the answer because when something is left after something evaporates that shows the chemical change.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.