Ionization energies

Successive energies required to remove electrons from a gaseous atom. Large jumps between successive steps indicate the start of a deeper shell.

Minimum 3,893906 eV Cesium

Maximum 24,587389 eV Helium

Moyenne 7,923129 eV

Données disponibles 108 sur 118

118 éléments affichés sur 118

	Symbole	Nom
1	H	Hydrogen	13,598435	—	—	—	—
2	He	Helium	24,587389	54,417953	—	—	—
3	Li	Lithium	5,391715	75,640357	122,454781	—	—
4	Be	Beryllium	9,322699	18,211213	153,896735	217,719334	—
5	B	Boron	8,298019	25,154917	37,930721	259,375272	340,227194
6	C	Carbon	11,260288	24,383227	47,887945	64,493742	392,09191
7	N	Nitrogen	14,53413	29,601352	47,445463	77,473767	97,890437
8	O	Oxygen	13,618055	35,121241	54,935729	77,413766	113,899392
9	F	Fluorine	17,42282	34,97093	62,708196	87,1753	114,249393
10	Ne	Neon	21,564541	40,963111	63,423518	97,190335	126,247435
11	Na	Sodium	5,139077	47,286523	71,620247	98,936341	138,404476
12	Mg	Magnesium	7,646236	15,035323	80,143876	109,265776	141,330486
13	Al	Aluminum	5,985769	18,828615	28,44774	119,992813	153,825729
14	Si	Silicon	8,15168	16,345906	33,493115	45,141945	166,767574
15	P	Phosphorus	10,486686	19,769558	30,202744	51,444047	65,025334
16	S	Sulfur	10,360017	23,33796	34,86012	47,222163	72,59475
17	Cl	Chlorine	12,967633	23,813722	39,800137	53,240183	67,680233
18	Ar	Argon	15,759612	27,629765	40,73514	59,580205	74,840258
19	K	Potassium	4,340664	31,625109	45,803258	60,91721	82,660285
20	Ca	Calcium	6,113155	11,87176	50,913335	67,273432	84,34029
21	Sc	Scandium	6,56149	12,799814	24,756924	73,489653	91,950317
22	Ti	Titanium	6,82812	13,575547	27,491805	43,267319	99,299342
23	V	Vanadium	6,746187	14,63405	29,311201	46,709161	65,281875
24	Cr	Chromium	6,76651	16,486362	30,959107	49,160169	69,460239
25	Mn	Manganese	7,434038	15,640044	33,668116	51,210176	72,410249
26	Fe	Iron	7,902468	16,199266	30,651106	54,910189	75,000258
27	Co	Cobalt	7,88101	17,084459	33,500115	51,270176	79,500274
28	Ni	Nickel	7,639878	18,168901	35,187121	54,920189	76,060262
29	Cu	Copper	7,72638	20,29246	36,841127	57,380198	79,800275
30	Zn	Zinc	9,394197	17,964452	39,723437	59,573205	82,600284
31	Ga	Gallium	5,999302	20,515211	30,725866	63,241218	86,010296
32	Ge	Germanium	7,899435	15,934665	34,057717	45,715657	90,500312
33	As	Arsenic	9,78855	18,589264	28,349098	50,150173	62,770216
34	Se	Selenium	9,752368	21,196073	31,697109	42,947148	68,300235
35	Br	Bromine	11,81381	21,591074	34,87112	47,782164	59,595205
36	Kr	Krypton	13,999605	24,359924	35,838123	50,850175	64,690223
37	Rb	Rubidium	4,177128	27,289634	39,247135	52,20018	68,440236
38	Sr	Strontium	5,694867	11,030314	42,883678	56,280194	70,700243
39	Y	Yttrium	6,21726	12,223642	20,524481	60,607409	75,350259
40	Zr	Zirconium	6,634126	13,130045	23,17008	34,418478	80,348277
41	Nb	Niobium	6,75885	14,320049	25,040086	37,611129	50,572974
42	Mo	Molybdenum	7,09243	16,160056	27,130093	40,330139	54,417187
43	Tc	Technetium	7,11938	15,260053	29,550102	41,000141	57,000196
44	Ru	Ruthenium	7,3605	16,760058	28,470098	45,000155	59,000203
45	Rh	Rhodium	7,4589	18,080062	31,060107	42,000145	63,000217
46	Pd	Palladium	8,336839	19,430067	32,930113	46,000158	61,00021
47	Ag	Silver	7,576234	21,484474	34,80012	49,000169	65,000224
48	Cd	Cadmium	8,99382	16,908371	37,468129	51,000176	67,900234
49	In	Indium	5,786356	18,870475	28,044247	55,450191	69,300239
50	Sn	Tin	7,343918	14,63312	30,506105	40,74014	77,030265
51	Sb	Antimony	8,608389	16,626057	25,323587	43,804151	55,000189
52	Te	Tellurium	9,009808	18,600064	27,840096	37,415629	59,300204
53	I	Iodine	10,451236	19,131326	29,570102	40,357139	51,520177
54	Xe	Xenon	12,129844	20,975072	31,050107	42,200145	54,100186
55	Cs	Cesium	3,893906	23,15753	33,195114	43,000148	56,000193
56	Ba	Barium	5,211665	10,00386	35,843923	47,000162	58,0002
57	La	Lanthanum	5,5769	11,184999	19,177366	49,950172	61,600212
58	Ce	Cerium	5,5386	10,956038	20,19747	36,906127	65,550226
59	Pr	Praseodymium	5,4702	10,631037	21,623774	38,981134	57,530198
60	Nd	Neodymium	5,52475	10,783037	22,090076	40,60014	60,000207
61	Pm	Promethium	5,58187	10,938038	22,440077	41,170142	61,700212
62	Sm	Samarium	5,643722	11,078038	23,550081	41,640143	62,700216
63	Eu	Europium	5,670385	11,240039	24,840086	42,940148	63,200218
64	Gd	Gadolinium	6,1498	12,076042	20,540071	44,440153	64,800223
65	Tb	Terbium	5,8638	11,51304	21,820075	39,330135	66,500229
66	Dy	Dysprosium	5,939061	11,64704	22,890079	41,230142	62,100214
67	Ho	Holmium	6,0215	11,781041	22,790078	42,520146	63,90022
68	Er	Erbium	6,1077	11,916041	22,700078	42,420146	65,100224
69	Tm	Thulium	6,184402	12,065042	23,660081	42,410146	65,400225
70	Yb	Ytterbium	6,25416	12,179227	25,053086	43,61015	65,600226
71	Lu	Lutetium	5,425871	14,130049	20,959472	45,249156	66,80023
72	Hf	Hafnium	6,82507	14,61005	22,550078	33,370115	68,370235
73	Ta	Tantalum	7,549571	16,200056	23,10008	35,00012	48,272166
74	W	Tungsten	7,86403	16,370056	26,000089	38,200131	51,600178
75	Re	Rhenium	7,83352	16,600057	27,000093	39,100135	51,900179
76	Os	Osmium	8,43823	17,000059	25,000086	41,000141	55,000189
77	Ir	Iridium	8,96702	17,000059	28,000096	40,000138	57,000196
78	Pt	Platinum	8,95883	18,560064	29,0001	43,000148	56,000193
79	Au	Gold	9,225554	20,20307	30,000103	45,000155	60,000207
80	Hg	Mercury	10,437504	18,756945	34,490119	48,550167	61,200211
81	Tl	Thallium	6,108287	20,42837	29,852103	51,140176	62,600215
82	Pb	Lead	7,41668	15,032551	31,93741	42,332706	68,800237
83	Bi	Bismuth	7,285516	16,703057	25,570838	45,370156	54,856189
84	Po	Polonium	8,41807	19,300066	27,300094	36,000124	57,000196
85	At	Astatine	9,31751	17,880062	26,580091	39,650136	50,390173
86	Rn	Radon	10,7485	18,990065	29,400101	36,900127	52,900182
87	Fr	Francium	4,072741	22,400077	33,500115	39,100135	50,000172
88	Ra	Radium	5,278424	10,147215	31,000107	41,000141	52,900182
89	Ac	Actinium	5,380235	11,75004	17,43606	44,800154	55,000189
90	Th	Thorium	6,3067	12,100042	18,320063	28,648099	58,0002
91	Pa	Protactinium	5,89	11,900041	18,600064	30,900106	44,300152
92	U	Uranium	6,19405	11,60004	19,800068	36,700126	46,000158
93	Np	Neptunium	6,265608	11,50004	19,700068	33,800116	48,000165
94	Pu	Plutonium	6,02576	11,50004	21,100073	35,00012	49,000169
95	Am	Americium	5,97381	11,70004	21,700075	36,800127	50,000172
96	Cm	Curium	5,992241	12,400043	20,100069	37,70013	51,000176
97	Bk	Berkelium	6,19785	11,900041	21,600074	36,000124	56,000193
98	Cf	Californium	6,281878	12,000041	22,400077	37,70013	51,900179
99	Es	Einsteinium	6,3684	12,200042	22,700078	38,800134	54,100186
100	Fm	Fermium	6,5	12,400043	23,20008	39,300135	55,000189
101	Md	Mendelevium	6,58	12,400043	24,300084	40,000138	54,100186
102	No	Nobelium	6,62621	12,930045	25,800089	41,500143	60,000207
103	Lr	Lawrencium	4,96	14,54005	21,800075	43,60015	56,000193
104	Rf	Rutherfordium	6,02	14,350049	23,840082	31,87011	64,00022
105	Db	Dubnium	6,8	14,000048	23,10008	33,000114	43,000148
106	Sg	Seaborgium	7,8	17,100059	25,800089	35,500122	47,200162
107	Bh	Bohrium	7,7	17,50006	26,700092	37,300128	49,000169
108	Hs	Hassium	7,6	18,200063	29,300101	37,70013	51,200176
109	Mt	Meitnerium	—	—	—	—	50,000172
110	Ds	Darmstadtium	—	—	—	—	—
111	Rg	Roentgenium	—	—	—	—	—
112	Cn	Copernicium	—	—	—	—	—
113	Nh	Nihonium	—	—	—	—	—
114	Fl	Flerovium	—	—	—	—	—
115	Mc	Moscovium	—	—	—	—	—
116	Lv	Livermorium	—	—	—	—	—
117	Ts	Tennessine	—	—	—	—	—
118	Og	Oganesson	—	—	—	—	—

Sources et notes

Statistics are computed for the first ionization energy; the table lists every measured step.