1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
IA
IIA
IIIB
IVB
VB
VIB
VIIB
VIIIB
IB
IIB
IIIA
IVA
VA
VIA
VIIA
VIIIA
1
1s
2
2s–2p
3
3s–3p
4
4s–3d–4p
5
5s–4d–5p
6
*
6s–5d–6p
7
**
7s–6d
*
4f
**
5f