Play a game to memorize the order in which orbitals fill. Have each group member in turn state the name of the next orbital to fill and the maximum number of electrons it can hold (for example, “1s two,” “2s two,” “2p six”). If a member gets stuck, other group members can help, consulting Figure 9.5 and the accompanying text summary if necessary. However, when a member gets stuck, the next player starts back at “1s two.” Keep going until each group member can list all the orbitals in order up to “6s two.”