Ionization Energy
1
H
Hydrogen
1312
2
He
Helium
2372.3
3
Li
Lithium
520
4
Be
Beryllium
899.5
5
B
Boron
800.6
6
C
Carbon
1086.5
7
N
Nitrogen
1402.3
8
O
Oxygen
1313.9
9
F
Fluorine
1681
10
Ne
Neon
2080.7
11
Na
Sodium
495.8
12
Mg
Magnesium
737.7
13
Al
Aluminium
577.5
14
Si
Silicon
786.5
15
P
Phosphorus
1011.8
16
S
Sulphur
999.6
17
Cl
Chlorine
1251.2
18
Ar
Argon
1520.6
19
K
Potassium
418.8
20
Ca
Calcium
589.8
21
Sc
Scandium
633.1
22
Ti
Titanium
658.8
23
V
Vanadium
650.9
24
Cr
Chromium
652.9
25
Mn
Manganese
717.3
26
Fe
Iron
762.5
27
Co
Cobalt
760.4
28
Ni
Nickel
737.1
29
Cu
Copper
745.5
30
Zn
Zinc
906.4
31
Ga
Galium
578.8
32
Ge
Germanium
762
33
As
Arsenic
947
34
Se
Selenium
941
35
Br
Bromine
1139.9
36
Kr
Krypton
1350.8
37
Rb
Rubidium
403
38
Sr
Strontium
549.5
39
Y
Yttrium
600
40
Zr
Zirconium
604.1
41
Nb
Niobium
652.1
42
Mo
Molybdenum
684.3
43
Tc
Technetium
702
44
Ru
Ruthenium
710.2
45
Rh
Rhodium
719.7
46
Pd
Palladium
804.4
47
Ag
Silver
731
48
Cd
Cadmium
867.8
49
In
Indium
867.8
50
Sn
Tin
708.6
51
Sb
Antimony
834
52
Te
Tellurium
869.3
53
I
Iodine
1008.4
54
Xe
Xenon
1170.4
55
Cs
Caesium
375.7
56
Ba
Barium
502.9
57
La
Lanthanum
538.1
58
Ce
Cerium
534.4
59
Pr
Praseodymium
527
60
Nd
Neodymium
533.1
61
Pm
Promethium
540
62
Sm
Samarium
544.5
63
Eu
Europium
547.1
64
Gd
Gadolinium
593.4
65
Tb
Terbium
565.8
66
Dy
Dysprosium
573
67
Ho
Holmium
581
68
Er
Erbium
589.3
69
Tm
Thulium
596.7
70
Yb
Ytterbium
603.4
71
Lu
Lutetium
523.5
72
Hf
Hafnium
658.5
73
Ta
Tantalum
761
74
W
Tungsten
770
75
Re
Rhenium
760
76
Os
Osmium
840
77
Ir
Iridium
880
78
Pt
Platinum
870
79
Au
Gold
890.1
80
Hg
Mercury
1007.1
81
Tl
Thallium
589.4
82
Pb
Lead
715.6
83
Bi
Bismuth
703
84
Po
Polonium
812.1
85
At
Astatine
920
86
Rn
Radon
1037
87
Fr
Francium
380
88
Ra
Radium
509.3
89
Ac
Actinium
499
90
Th
Thorium
587
91
Pa
Protactinium
568
92
U
Uranium
597.6
93
Np
Neptunium
604.5
94
Pu
Plutonium
584.7
94
Am
Americium
578
96
Cm
Curium
581
97
Bk
Berkelium
601
98
Cf
Californium
608
99
Es
Einsteinium
619
100
Fm
Fermium
627
101
Md
Mendelevium
635
102
No
Nobelium
642