to find out, don showalter went to st. albans school on the grounds of the national cathedral in washington, d.c. we will show you how the electrons fill up the various energy levels that you saw on that diagram. to help us, we have 11 baseball players. right, coach! these baseball players will now represent electrons. we will have an electron practice. they're going to practice the rules that chemists use to fill the energy levels. here's the ground rules. these bleachers represent the various energy levels, the lowest one being the 1s, colored blue. the next energy level is the 2s. it's colored green. all right. now the 2p has 3 sublevels, and it's colored red. 2p with 3 sublevels! good! the highest energy level is the 3s, and it's colored yellow. all right. now, there are three basic rules that we have to follow. rule number one--electrons fill lowest energy level first. ok. here's rule number two. no more than two electrons in any one orbital. beautiful! here's rule three. if there's more than one orbital in a sublevel