Question

An electron in a sodium atom moves from the third shell to the fourth shell. This change is a result of the atom

(1) absorbing energy (3) gaining an electron
(2) releasing energy (4) losing an electron

Answer 1

The answer is (1) absorbing energy. The electrons just change the shell position. So there is no losing or gaining. And the outer shell has higher energy than inner shell. So the atom is absorbing energy.