Table shows ionization energy of chemical elements given in kJ/mol.

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Ionization energy#

Atomic number	Element name	Element symbol	1-st ionization energy [kJ/mol]	2-nd ionization energy [kJ/mol]	3-rd ionization energy [kJ/mol]	4-th ionization energy [kJ/mol]
1	Hydrogen	H	1.312	-	-	-
2	Helium	He	2.372	5.251	-	-
3	Lithium	Li	520.3	7.298	11.815	-
4	Beryllium	Be	899.5	1.757	14.849	21.007
5	Boron	B	800.7	2.427	3.66	25.026
6	Carbon	C	1.086	2.353	4.621	6.223
7	Nitrogen	N	1.402	2.856	7.475	9.445
8	Oxygen	O	1.314	3.388	5.301	7.469
9	Fluorine	F	1.681	3.374	6.051	8.408
10	Neon	Ne	2.081	3.952	6.122	9.37
11	Sodium	Na	495.9	4.563	6.913	9.544
12	Magnesium	Mg	737.8	1.451	7.733	10.541
13	Aluminium	Al	577.6	1.817	2.745	11.578
14	Silicon	Si	786.5	1.577	3.232	4.356
15	Phosphorous	P	1.012	1.903	2.912	4.957
16	Sulfur	S	999.6	2.251	3.361	4.564
17	Chlorine	Cl	1.251	2.297	3.822	5.158
18	Argon	Ar	1.521	2.666	3.931	5.771
19	Potassium	K	418.9	3.051	4.412	5.877
20	Calcium	Ca	589.8	1.145	4.912	6.474
21	Scandium	Sc	631	1.235	2.389	7.089
22	Titanium	Ti	658	1.31	2.653	4.175
23	Vanadium	V	650	1.414	2.828	4.507
24	Chromium	Cr	652.9	1.592	2.987	4.74
25	Manganese	Mn	717.4	1.509	3.249	4.94
26	Iron	Fe	759.4	1.561	2.958	5.29
27	Cobalt	Co	758	1.646	3.232	4.95
28	Nickel	Ni	736.7	1.753	3.394	5.3
29	Copper	Cu	745.5	1.958	3.554	5.33
30	Zinc	Zn	906.4	1.733	3.833	5.73
31	Gallium	Ga	578.8	1.979	2.963	6.2
32	Germanium	Ge	762.2	1.537	3.302	4.411
33	Arsenic	As	947	1.798	2.736	4.837
34	Selenium	Se	941	2.045	2.974	4.144
35	Bromine	Br	1.14	2.1	3.5	4.56
36	Krypton	Kr	1.351	2.368	3.565	5.07
37	Rubidium	Rb	403	2.632	3.9	5.08
38	Strontium	Sr	549.5	1.064	4.21	5.5
39	Yttrium	Y	616	1.181	1.98	5.96
40	Zirconium	Zr	660	1.267	2.218	3.313
41	Niobium	Nb	664	1.382	2.416	3.7
42	Molybdenium	Mo	685	1.558	2.621	4.48
43	Technetium	Tc	702	1.472	2.85	-
44	Ruthenium	Ru	711	1.617	2.747	-
45	Rhodium	Rh	720	1.745	2.997	-
46	Palladium	Pd	805	1.875	3.177	-
47	Silver	Ag	731	2.074	3.361	-
48	Cadmium	Cd	867.7	1.631	3.616	-
49	Indium	In	558.3	1.821	2.705	5.2
50	Tin	Sn	708.6	1.412	2.943	3.93
51	Antimony	Sb	833.8	1.595	2.44	4.26
52	Tellurium	Te	869.3	1.79	2.698	3.61
53	Iodine	I	1.008	1.846	3.2	-
54	Xenon	Xe	1.17	2.047	3.1	-
55	Cesium	Cs	375.7	2.42	-	-
56	Barium	Ba	502.9	965.3	-	-
57	Lanthanum	La	538.1	1.067	1.85	4.82
58	Cerium	Ce	527.4	1.047	1.949	3.547
59	Praseodymium	Pr	523.2	1.018	2.086	3.761
60	Neodymium	Nd	529.6	1.035	2.13	3.899
61	Promethium	Pm	535.9	1.052	2.15	3.97
62	Samarium	Sm	543.3	1.068	2.26	3.99
63	Europium	Eu	546.7	1.085	2.405	4.11
64	Gadolinium	Gd	592.6	1.167	1.991	4.25
65	Terbium	Tb	564.7	1.112	2.114	3.839
66	Dysprosium	Dy	571.9	1.126	2.2	4.001
67	Holmium	Ho	580.7	1.139	2.204	4.1
68	Erbium	Er	588.7	1.151	2.194	4.115
69	Thulium	Tm	596.7	1.163	2.544	4.119
70	Ytterbium	Yb	603.4	1.176	2.415	4.22
71	Lutetium	Lu	523.6	1.34	2.022	4.36
72	Hafnium	Hf	680	1.44	2.25	3.215
73	Tantalum	Ta	761	-	-	-
74	Tungsten	W	770	-	-	-
75	Rhenium	Re	760	-	-	-
76	Osmium	Os	840	-	-	-
77	Iridium	Ir	880	-	-	-
78	Platinum	Pt	870	1.791	-	-
79	Gold	Au	890.1	1.98	-	-
80	Mercury	Hg	1.007	1.81	3.3	-
81	Thalium	Tl	589.4	1.971	2.878	-
82	Lead	Pb	715.6	1.45	3.082	4.083
83	Bismuth	Bi	703.3	1.61	2.466	4.37
84	Polonium	Po	812	-	-	-
85	Astatine	At	890	-	-	-
86	Radon	Rn	1.037	-	-	-
87	Francium	Fr	384	-	-	-
88	Radium	Ra	509.4	971.9	-	-
89	Actinium	Ac	499	-	-	-
90	Thorium	Th	587	-	-	-
91	Protactinium	Pa	568	-	-	-
92	Uranium	U	584	-	-	-
93	Neptunium	Np	597	-	-	-
94	Plutonium	Pu	585	-	-	-
95	Americium	Am	578	-	-	-
96	Curium	Cm	581	-	-	-
97	Berkelium	Bk	601	-	-	-
98	Californium	Cf	608	-	-	-
99	Einsteinium	Es	619	-	-	-
100	Fermium	Fm	627	-	-	-
101	Mendelevium	Md	635	-	-	-
102	Nobelium	No	642	-	-	-
103	Lawrencium	Lr	470	-	-	-
104	Rutherfordium	Rf	580	-	-	-

Some facts#

Ionization energy is minimal energy needed to detach the electron from the atom or molecule.
In atomic physics ionization energy is usually given in electron volts per atom (eV), while kilojoule per mol (kJ/mol) is more common in chemistry. Both units points to the same property and it is possible to convert one into the other and vice versa.
To convert ionization energy from electronvolts to kilojoules per mol or vice versa we need to use below formula:

$1 eV = 96.49 \dfrac{kJ}{mol}$
If you need to convert ionization energy between above or less common units, you can use our another calculator: energy units converter.
The energy needed to detach one electron is called the first ionization energy, to detach next one the second ionization energy, etc.
The first ionization energy of the neutral molecule (without charge) is approximately equal to the energy of the highest occupied molecular orbital (HOMO). This approximation is known as the Koopmans theorem.

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