When electrons absorb energy they are able to
a. move from exited states down to their ground states. b.move from their ground states up to excited states. c.attach to the nucleus. d.form a bond with the nearest proton.?

When electrons absorb energy they are able to move from their ground states up to excited states. The answer is letter B. an example of this is when you light a match. The molecules of the matchstick are in its ground state. When you flick it on the ground or anything hard, it causes its molecules to move into the excited state and thus causing fire.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements