APPENDIX V 
263 
TABLE OF ELECTRON GROUPS IN THE CHEMICAL 
ELEMENTS 
(Reproduced from Fowler’s Presidential Address to Section A of the British 
Association, Section A, 1926.) 
Arrangement of Electrons in Atoms. 
N.B.—For convenience in printing the half quantum numbers in column 4 
have all been increased by See pp. 63 and 81. 
T3 
0 
'u 
<v 
ÇU 
I 
Atomic 
Number 
Element 
Spectro 
scopic 
Term/ lj 
Number of Electrons in Shell of Quantum Number 
K 
in 
u 
2n 
Lu 
2 2 i 
Lui 
2 2 2 
Mi 
3n 
Mu 
321 
Mm 
322 
Mxv 
332 
M v 
333 
N1 
4n 
N„ 
421 
Nui 
422 
1 
2 
H 
He 
îq * 
°o 
1 
2 
2 
3 
Li 
2 S I * 
2 
i 
4 
Be 
% 
2 
2 
5 
B 
2 Pl 
2 
2 
1 
6 
C 
3 Po 
2 
2 
2 
7 
N 
4 s 2 
2 
2 
2 
i 
8 
O 
3 P 2 * 
2 
2 
2 
2 
9 
F 
2 P 2 
2 
2 
2 
3 
10 
Ne 
%* 
2 
2 
2 
4 
3 
11 
Na 
2 Sl * 
2 
2 
2 
4 
I 
12 
Mg 
1Q * 
°0 
2 
2 
2 
4 
2 
13 
Al 
2Pi * 
2 
2 
2 
4 
2 
1 
14 
Si 
3 P„* 
2 
2 
2 
4 
2 
2 
15 
P 
4 s 2 
2 
2 
2 
4 
2 
2 
1 
16 
S 
3 p 2 * 
2 
2 
2 
4 
2 
2 
2 
17 
Cl 
2 P 2 
2 
2 
2 
4 
2 
2 
3 
18 
A 
% 
2 
2 
2 
4 
2 
2 
4 
4 
19 
K 
% * 
2 
2 
2 
4 
2 
2 
4 
[ 
20 
Ca 
X S 0 * 
2 
2 
2 
4 
2 
2 
4 
2 
21 
Sc 
2 d 2 * 
2 
2 
2 
4 
2 
2 
4 
1 
2 
22 
Ti 
3 f 2 * 
2 
2 
2 
4 
2 
2 
4 
2 
2 
23 
V 
4 F 2 * 
2 
2 
2 
4 
2 
2 
4 
3 
2 
24 
Cr 
7 s 3 * 
2 
2 
2 
4 
2 
2 
4 
4 
I 
I 
25 
Mn 
6 S 3 * 
2 
2 
2 
4 
2 
2 
4 
4 
I 
2 
26 
Fe 
5 Dl * 
2 
2 
2 
4 
2 
2 
4 
4 
2 
2 
27 
Co 
4 F 6 * 
2 
2 
2 
4 
2 
2 
4 
4 
3 
2 
28 
Ni 
3 f 4 * 
2 
2 
2 
4 
2 
2 
4 
4 
4 
2 
29 
Cu 
% * 
2 
2 
2 
4 
2 
2 
4 
4 
6 
I 
30 
Zn 
1Q * 
°0 
2 
2 
2 
4 
2 
2 
4 
4 
6 
2 
31 
Ga 
2 Pi * 
2 
2 
2 
4 
2 
2 
4 
4 
6 
2 
1 
32 
Ge 
3 Po 
2 
2 
2 
4 
2 
2 
4 
4 
6 
2 
2 
33 
As 
4 Sj 
2 
2 
2 
4 
2 
2 
4 
4 
6 
2 
2 
I 
34 
Se 
3 P 2 
2 
2 
2 
4 
2 
2 
4 
4 
6 
2 
2 
2 
35 
Br 
2 P 2 
2 
2 
2 
4 
2 
2 
4 
4 
6 
2 
2 
3 
36 
Kr 
% 
2 
2 
2 
4 
2 
2 
4 
4 
6 
2 
2 
4