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1. barium:
1
s
2
2
s
2
2
p
6
3
2
3
p
6
4
s
2
3
d
10
p
6
5
s
2
4
d
5
p
6
6
s
2
2. sulfur:
1
s
2
2
s
2
2
p
6
s
2
3
p
3. rubidium:
1
s
2
2
s
2
2
p
6
3
s
2
p
6
4
2
3
d
10
4
p
6
5
s
4. krypton:
1
s
2
2
s
2
p
6
3
s
2
3
p
6
4
s
2
3
d
4
p