An electron in a sodium atom gains enough energy to move from the second shell to the third the sodium atom becomes

When an electron in a sodium atom gains enough energy to move from the second shell to the third the sodium atom becomes

an atom in excited state

Explanation

. The excited state occurs when valence electron absorb energy. The excited state takes the forms of electrons jumping from original energy level (ground state) to empty orbital. When atom is in excited state it has a higher energy than in ground state