ABSTRACT
Ionization Potentials of the Elements
Element
Ionization Potential eV
Element
Ionization Potential eV
Element
Ionization Potential eV
Element
Ionization Potential eV
Ar
15.755
Eu
5.67
Na
5.138
Sc
6.54
Ac
6.9
F
17.418
Nb
6.88
Se
9.75
Ag
7.574
Fe
7.87
Nd
5.51
Si
8.149
Al
5.984
Fr
4.0
Ne
21.559
Sm
5.6
As
9.81
Ga
6.0
Ni
7.633
Sn
7.342
At
9.5
Gd
6.16
O
13.614
Sr
5.692
Au
9.22
Ge
7.88
Os
8.5
Ta
7.88
B
8.296
H
13.595
P
10.484
Tb
5.98
Ba
5.21
He
24.481
Pb
7.415
Tc
7.28
Be
9.32
Hf
7
Pd
8.33
Te
9.01
Bi
7.287
Hg
10.43
Po
8.43
Th
6.95
Br
11.84
I
10.454
Pr
5.46
Ti
6.82
C
11.256
In
5.785
Pt
9.0
Tl
6.106
Ca
6.111
Ir
9
Pu
5.1
Tm
5.81
Cd
8.991
K
4.339
Ra
5.277
U
6.08
Ce
5.6
Kr
13.996
Rb
4.176
V
6.74
Cl
13.01
La
5.61
Re
7.87
W
7.98
Co
7.86
Li
5.39
Rh
7.46
Xe
12.127
Cr
6.764
Mg
7.644
Rn
10.746
Y
6.38
Cs
3.893
Mn
7.432
Ru
7.364
Yb
6.2
Cu
7.724
Mo
7.10
S
10.357
Zn
9.391
Dy
6.8
N
14.53
Sb
8.639
Zr
6.84
Er
6.08
From Handbook of Chemistry and Physics, 52nd ed., The Chemical Rubber Co., Cleveland, 1971.