Which statement is correct? a
Electrons emit light when they fall back down into lower energy levels
b
Electrons never emit light.
c
Electrons emit light when they move up into higher energy levels.
d
Electrons emit light at all times.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate, what happens to the atoms?