Which goes with which?
a. 1s
b. 2s
c. 3s
d. 4s
e. 5s
f. 6s
g. 7s
h. 2p
i. 3p
j. 4p
k. 5p
l. 6p
m. 7p
n. 3d
o. 4d
p. 5d
q. 6d
r. 7d
s. 4f
t. 5f

1. what orbital is filled directly before the 4s?
2. what orbital is filled directly after the 4s?
3. what orbital is filled directly first 3d, or 4s?
4. what orbital is filled directly after the 5p?
5. what orbital is filled directly after the 2p?
6. what orbital is filled directly before the 4f?
7. what orbital is filled directly before the 6p?
8. what orbital is filled directly after the 7s?
9. what orbital is filled directly before the 4p?
10. what orbital is filled first?