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Highest ionization energy

Elements ranked by Highest ionization energy.

#	Symbol	Element	Highest ionization energy
1	As	Arsenic	9.81
2	Se	Selenium	9.75
3	At	Astatine	9.5
4	Zn	Zinc	9.39
5	Be	Beryllium	9.32
6	Au	Gold	9.23
7	Ir	Iridium	9.1
8	Te	Tellurium	9.01
9	Pt	Platinum	9
10	Cd	Cadmium	8.99
11	Os	Osmium	8.7
12	Sb	Antimony	8.64
13	Po	Polonium	8.42
14	Pd	Palladium	8.34
15	B	Boron	8.3
16	Si	Silicon	8.15
17	W	Tungsten	7.98
18	Fe	Iron	7.9
19	Ge	Germanium	7.9
20	Ta	Tantalum	7.89
21	Co	Cobalt	7.88
22	Re	Rhenium	7.88
23	Cu	Copper	7.73
24	Mg	Magnesium	7.65
25	Ni	Nickel	7.64
26	Ag	Silver	7.58
27	Rh	Rhodium	7.46
28	Mn	Manganese	7.43
29	Pb	Lead	7.42
30	Ru	Ruthenium	7.36
31	Sn	Tin	7.34
32	Bi	Bismuth	7.29
33	Tc	Technetium	7.28
34	Mo	Molybdenum	7.09
35	Ti	Titanium	6.83
36	Hf	Hafnium	6.83
37	Cr	Chromium	6.77
38	Nb	Niobium	6.76
39	V	Vanadium	6.75
40	No	Nobelium	6.65
41	Zr	Zirconium	6.63
42	Md	Mendelevium	6.58
43	Sc	Scandium	6.56
44	Fm	Fermium	6.5
45	Es	Einsteinium	6.42
46	Cf	Californium	6.3
47	Np	Neptunium	6.27
48	Yb	Ytterbium	6.25
49	Bk	Berkelium	6.23
50	Y	Yttrium	6.22
51	U	Uranium	6.19
52	Tm	Thulium	6.18
53	Gd	Gadolinium	6.15
54	Ca	Calcium	6.11
55	Tl	Thallium	6.11
56	Er	Erbium	6.11
57	Th	Thorium	6.08
58	Pu	Plutonium	6.06
59	Ho	Holmium	6.02
60	Cm	Curium	6.02
61	Ga	Gallium	6
62	Am	Americium	5.99
63	Al	Aluminum	5.99
64	Dy	Dysprosium	5.94
65	Pa	Protactinium	5.89
66	Tb	Terbium	5.86
67	In	Indium	5.79
68	Sr	Strontium	5.7
69	Eu	Europium	5.67
70	Sm	Samarium	5.64
71	La	Lanthanum	5.58
72	Pm	Promethium	5.55
73	Ce	Cerium	5.54
74	Nd	Neodymium	5.53
75	Pr	Praseodymium	5.46
76	Lu	Lutetium	5.43
77	Li	Lithium	5.39
78	Ra	Radium	5.28
79	Ba	Barium	5.21
80	Ac	Actinium	5.17
81	Na	Sodium	5.14
82	K	Potassium	4.34
83	Rb	Rubidium	4.18
84	Fr	Francium	3.9
85	Cs	Cesium	3.89
86	He	Helium	24.59
87	Ne	Neon	21.57
88	F	Fluorine	17.42
89	Ar	Argon	15.76
90	N	Nitrogen	14.53
91	Kr	Krypton	14
92	O	Oxygen	13.62
93	H	Hydrogen	13.6
94	Cl	Chlorine	12.97
95	Xe	Xenon	12.13
96	Br	Bromine	11.81
97	C	Carbon	11.26
98	Rn	Radon	10.74
99	P	Phosphorus	10.49
100	I	Iodine	10.45
101	Hg	Mercury	10.44
102	S	Sulfur	10.36