Electron configurations

Ground states of single gas phase atoms

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 H                                 He
2 Li Be                     B C N O F Ne
3 Na Mg                     Al Si P S Cl Ar
4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
6 Cs Ba * Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
7 Fr Ra ** Rf Db Sg Bh Hs Mt Ds Rg Cn            
 
* La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu *
** Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr **


Z Element Symbol GCSE A-level Short Term symbol s p d f
1
H
1
1s1
1s1
2S1/2
1
0
0
0
2
He
2
1s2
1s2
1S0
2
0
0
0
3
Li
2.1
1s22s1
[He]2s1
2S1/2
1
0
0
0
4
beryllium
Be
2.2
1s22s2
[He]2s2
1S0
2
0
0
0
5
boron
B
2.3
1s22s22p1
[He]2s22p1
2P1/2
2
1
0
0
6
carbon
C
2.4
1s22s22p2
[He]2s22p2
3P0
2
2
0
0
7
nitrogen
N
2.5
1s22s22p3
[He]2s22p3
4S3/2
2
3
0
0
8
oxygen
O
2.6
1s22s22p4
[He]2s22p4
3P2
2
4
0
0
9
fluorine
F
2.7
1s22s22p5
[He]2s22p5
2S1/2
2
5
0
0
10
neon
Ne
2.8
1s22s22p6
[He]2s22p6
1S0
2
6
0
0
11
sodium
Na
2.8.1
2S1/2
1
0
0
0
12
magnesium
Mg
2.8.2
1S0
2
0
0
0
13
aluminium
Al
2.8.3
2S1/2
2
1
0
0
14
silicon
Si
2.8.4
1S0
2
2
0
0
15
P
2.8.5
2P1/2
2
3
0
0
16
sulfur
S
2.8.6
3P0
2
4
0
0
17
chlorine
Cl
2.8.7
4S3/2
2
5
0
0
18
argon
Ar
2.8.8
3P2
2
6
0
0
19
potassium
K
2.8.8.1
1s22s22p63s23p64s1
[Ar]4s1
2S1/2
1
0
0
0
20
calcium
Ca
2.8.8.2
1s22s22p63s23p64s2
[Ar]4s2
1S0
2
0
0
0
21
Sc
2.8.8.3
1s22s22p63s23p63d14s2
2D3/2
2
0
1
0
22
titanium
Ti
2.8.8.4
3F2
2
0
2
0
23
vanadium
V
2.8.8.5
2
0
3
0
24
chromium
Cr
2.8.8.6
1
0
5
0
25
manganese
Mn
2.8.8.7
0
26
iron
Fe
2.8.8.8
0
27
cobalt
Co
2.8.8.9
0
28
nickel
Ni
2.8.8.10
0
29
copper
Cu
2.8.8.11
0
30
zinc
Zn
2.8.8.12
0
31
gallium
Ga
2.8.8.13
32
germanium
Ge
2.8.8.14
33
arsenic
As
2.8.8.15
34
selenium
Se
2.8.8.16
35
bromine
Br
2.8.8.17
36
krypton
Kr
2.8.8.18
37
rubidium
Rb
2.8.8.18.1
38
strontium
Sr
2.8.8.18.2
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
La
58
Ce
59
Pr
60
neodymium
Nd
2.8.18.22.8.2
5I4
61
promethium
Pm
2.8.18.23.8.2
6H5/2
62
samarium
Sm
2.8.18.24.8.2
7F0
63
europium
Eu
2.8.18.25.8.2
[Xe]4f76s2
8S7/2
2
7
64
Gd
2.8.8.18.25.9.2
[Xe]4f75d16s2
9D2
2
1
7
65
terbium
Tb
2.8.18.27.8.2
[Xe]4f96s2
2
9
66
dysprosium
Dy
2.8.18.28.8.2
[Xe]4f106s2
5I8
2
10
67
holmium
Ho
2.8.18.29.8.2
[Xe]4f116s2
4I15/2
2
11
68
Er
69
Tm
70
Yb
71
Lu


GCSE-level theory

See http://www.benjamin-mills.com/teaching/chemistry/GCSE/electron-configurations/.