Protactinium Pa IV
Odd levels
Even levels
5f 6d
3
H
4
20 000 ± 6 000
5f 7s
3
F
2
37 000 ± 7 000
5f
2
3
H
4
0
6d
2
3
F
2
45 000 ± 10 000
5f 7p
3
G
3
75 000 ± 5 000