Ionization Energies, Electron Affinities and Electronegativies of the Elements



IE
EA
1
H
1310
67.4
2.20
































































2
He
2372
-60.2
*


IE
EA
3
Li
519
77.0
0.98
4
Be
900
-18.4
1.57








































5
B
799
31.8
2.04
6
C
1088
119.7
2.55
7
N
1406
4.6
3.04
8
O
1314
141.8
3.44
9
F
1682
349.4
3.98
10
Ne
2080
-54.8
*


IE
EA
11
Na
498
117.2
0.93
12
Mg
736
0
1.31








































13
Al
577
50.2
1.61
14
Si
787
138.1
1.90
15
P
1063
75.3
2.19
16
S
1000
199.6
2.58
17
Cl
1255
356.1
3.16
18
Ar
2372
-60.2
*


IE
EA
19
K
1310
67.4
2.20
20
Ca
590
*
1.00
21
Sc
632
*
1.36
22
Ti
661
*
1.54
23
V
653
*
1.63
24
Cr
653
*
1.66
25
Mn
715
*
1.55
26
Fe
761
*
1.8
27
Co
757
*
1.88
28
Ni
736
*
1.91
29
Cu
745
*
1.90
30
Zn
904
*
1.65
31
Ga
577
*
1.81
32
Ge
782
*
2.01
33
As
966
*
2.18
34
Se
941
*
2.55
35
Br
1142
333.0
2.96
36
Kr
1351
*
*


IE
EA
37
Rb
402
*
0.82
38
Sr
548
*
0.95
39
Y
636
*
1.22
40
Zr
669
*
1.33
41
Nb
653
*
1.6
42
Mo
695
*
2.16
43
Tc
699
*
1.9
44
Ru
724
*
2.28
45
Rh
745
*
2.2
46
Pd
803
*
2.20
47
Ag
732
*
1.93
48
Cd
866
*
1.69
49
In
556
*
1.78
50
Sn
707
*
1.96
51
Sb
833
*
2.05
52
Te
870
*
2.1
53
I
1008
304.2
2.66
54
Xe
1172
*
*


IE
EA
55
Cs
377
*
0.79
56
Ba
502
*
0.89
57
La
540
*
1.10
72
Hf
531
*
1.3
73
Ta
577
*
1.5
74
W
770
*
2.36
75
Re
761
*
1.9
76
Os
841
*
2.2
77
Ir
887
*
2.2
78
Pt
866
*
2.28
79
Au
891
*
2.54
80
Hg
1008
*
2.00
81
Tl
590
*
2.04
82
Pb
715
*
2.33
83
Bi
774
*
2.02
84
Po
*
*
2.0
85
At
*
*
2.2
86
Rn
1038
*
*

Ionization Energy (IE) and Electron Affinities (EA) are expressed as kilojoules per mole.
1 eV = 96,490 J/mol
Source: R.E. Dickerson, H.B. Gray and G.P. Haight, "Chemical Principles," 3rd edition, Benjamin/Cummings Publishing, 1979.