List of Elements in Order of Ionization Energy (eV)

List of elements ordered by ionization energy is listed in the table below with atomic number, chemical symbol and ionization energy (eV). To list the elements order by ionization energy, click on the table headers. You can print the list of elements by hitting the print button below.

The element which has the highest ionization energy is Helium with 24.58741 eV. And the element which has the lowest ionization energy is Caesium in 3.8939 eV.

Atomic NumberChemical SymbolElement NameIonization Energy (eV)
2HeHelium24.58741
10NeNeon21.5646
9FFluorine17.42282
18ArArgon15.75962
7NNitrogen14.53414
36KrKrypton13.99961
8OOxygen13.61806
1HHydrogen13.59844
17ClChlorine12.96764
54XeXenon12.1298
35BrBromine11.81381
6CCarbon11.2603
86RnRadon10.7485
15PPhosphorus10.48669
53IIodine10.45126
80HgMercury10.4375
16SSulfur10.36001
33AsArsenic9.7886
34SeSelenium9.75238
30ZnZinc9.3942
4BeBeryllium9.3227
79AuGold9.2255
52TeTellurium9.0096
48CdCadmium8.9938
77IrIridium8.967
78PtPlatinum8.9587
51SbAntimony8.6084
76OsOsmium8.4382
84PoPolonium8.417
46PdPalladium8.3369
5BBoron8.29803
14SiSilicon8.15169
26FeIron7.9024
32GeGermanium7.8994
28NiNickel7.881
74WTungsten7.864
75ReRhenium7.8335
29CuCopper7.72638
12MgMagnesium7.64624
27CoCobalt7.6398
47AgSilver7.5762
73TaTantalum7.5496
45RhRhodium7.4589
25MnManganese7.43402
82PbLead7.41666
44RuRuthenium7.3605
50SnTin7.3439
83BiBismuth7.2856
43TcTechnetium7.28
42MoMolybdenum7.09243
22TiTitanium6.8281
72HfHafnium6.82507
24CrChromium6.7665
41NbNiobium6.75885
23VVanadium6.7462
102NoNobelium6.65
40ZrZirconium6.6339
101MdMendelevium6.58
21ScScandium6.5615
100FmFermium6.5
99EsEinsteinium6.42
90ThThorium6.3067
98CfCalifornium6.2817
93NpNeptunium6.2657
70YbYtterbium6.25416
39YYttrium6.2171
97BkBerkelium6.1979
92UUranium6.19405
69TmThulium6.18431
64GdGadolinium6.1501
20CaCalcium6.11316
81TlThallium6.1082
68ErErbium6.1077
94PuPlutonium6.0262
67HoHolmium6.0215
104RfRutherfordium6
31GaGallium5.9993
96CmCurium5.9915
13AlAluminium5.98577
95AmAmericium5.9738
66DyDysprosium5.9389
91PaProtactinium5.89
65TbTerbium5.8638
49InIndium5.78636
38SrStrontium5.6949
63EuEuropium5.6704
62SmSamarium5.6436
61PmPromethium5.582
57LaLanthanum5.5769
58CeCerium5.5387
60NdNeodymium5.525
59PrPraseodymium5.473
71LuLutetium5.4259
3LiLithium5.39172
88RaRadium5.2784
56BaBarium5.2117
89AcActinium5.17
11NaSodium5.13908
103LrLawrencium4.9
19KPotassium4.34066
37RbRubidium4.17713
87FrFrancium4.0727
55CsCaesium3.8939

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