Ion Chemistry Laboratory
Centre for Research in Mass Spectrometry
 York University

 

Periodic Table of First Ionization Energies (eV)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H
13.588		                                 He
24.587
Li
5.392		 Be
9.323		                     B
8.298		 C
11.260		 N
14.534		 O
13.618		 F
17.423		 Ne
21.565
Na
5.139		 Mg
7.646		                     Al
5.986		 Si
8.152		 P
10.487		 S
10.360		 Cl
12.968		 Ar
15.760
K
4.341		 Ca
6.113		 Sc
6.562		 Ti
6.828		 V
6.746		 Cr
6.767		 Mn
7.434		 Fe
7.902		 Co
7.881		 Ni
7.640		 Cu
7.726		 Zn
9.394		 Ga
5.999		 Ge
7.899		 As
9.789		 Se
9.752		 Br
11.814		 Kr
14.000
Rb
4.177		 Sr
5.695		 Y
6.217		 Zr
6.634		 Nb
6.759		 Mo
7.092		 Tc
7.28		 Ru
7.361		 Rh
7.459		 Pd
8.337		 Ag
7.576		 Cd
8.994		 In
5.786		 Sn
7.344		 Sb
8.608		 Te
9.010		 I
10.451		 Xe
12.130
Cs
3.894		 Ba
5.212		 La
5.577		 Hf
6.825		 Ta
7.550		 W
7.864		 Re
7.834		 Os
8.438		 Ir
8.967		 Pt
8.959		 Au
9.226		 Hg
10.438		 Tl
6.108		 Pb
7.417		 Bi
7.286		 Po
8.417		 At
NA		 Rn
10.749
Fr
4.073		 Ra
5.278		 Ac
5.17		 Rf
6.0		 Ha
na		 Sg
na
  Lan. Ce
5.539		 Pr
5.473		 Nd
5.525		 Pm
5.582		 Sm
5.644		 Eu
5.670		 Gd
6.150		 Tb
5.864		 Dy
5.939		 Ho
6.022		 Er
6.108		 Tm
6.184		 Yb
6.254		 Lu
5.426
  Act. Th
6.307		 Pa
5.89		 U
6.194		 Np
6.266		 Pu
6.026		 Am
5.974		 Cm
6.02		 Bk
6.198		 Cf
6.282		 Es
6.42		 Fm
6.50		 Md
6.58		 No
6.65		 Lr
4.9
From: NIST Physics Laboratory, Physical Reference Data
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Ion Chemistry Laboratory, York University 4700 Keele Street, Toronto, Ontario M3J 1P3