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?

zfoods? ok, pressure is used to keep the heat inside and to keep the food perfect.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6