Ionization energies of the elements: Encyclopedia of chemistry, analytics & pharmaceutics with 64,557 entries.

Ionization energies of the elements

These tables list the ionization energy in kJ/mol necessary to remove an electron from a neutral atom (first energy), respectively from a singly, doubly, etc. ionized atom (second, third, etc. energies).

1 1st–10th
2 11th–20th
3 21st–30th
4 References

1st–10th

number	symbol	name	1st	2nd	3rd	4th	5th	6th	7th	8th	9th	10th
1	H	hydrogen	1312.0
2	He	helium	2372.3	5250.5
3	Li	lithium	520.2	7298.1	11815.0
4	Be	beryllium	899.5	1757.1	14848.7	21006.6
5	B	boron	800.6	2427.1	3659.7	25025.8	32826.7
6	C	carbon	1086.5	2352.6	4620.5	6222.7	37831	47277.0
7	N	nitrogen	1402.3	2856	4578.1	7475.0	9444.9	53266.6	64360
8	O	oxygen	1313.9	3388.3	5300.5	7469.2	10989.5	13326.5	71330	84078.0
9	F	fluorine	1681.0	3374.2	6050.4	8407.7	11022.7	15164.1	17868	92038.1	106434.3
10	Ne	neon	2080.7	3952.3	6122	9371	12177	15238	19999.0	23069.5	115379.5	131432
11	Na	sodium	495.8	4562	6910.3	9543	13354	16613	20117	25496	28932	141362
12	Mg	magnesium	737.7	1450.7	7732.7	10542.5	13630	18020	21711	25661	31653	35458
13	Al	aluminium	577.5	1816.7	2744.8	11577	14842	18379	23326	27465	31853	38473
14	Si	silicon	786.5	1577.1	3231.6	4355.5	16091	19805	23780	29287	33878	38726
15	P	phosphorus	1011.8	1907	2914.1	4963.6	6273.9	21267	25431	29872	35905	40950
16	S	sulfur	999.6	2252	3357	4556	7004.3	8495.8	27107	31719	36621	43177
17	Cl	chlorine	1251.2	2298	3822	5158.6	6542	9362	11018	33604	38600	43961
18	Ar	argon	1520.6	2665.8	3931	5771	7238	8781	11995	13842	40760	46186
19	K	potassium	418.8	3052	4420	5877	7975	9590	11343	14944	16963.7	48610
20	Ca	calcium	589.8	1145.4	4912.4	6491	8153	10496	12270	14206	18191	20385
21	Sc	scandium	633.1	1235.0	2388.6	7090.6	8843	10679	13310	15250	17370	21726
22	Ti	titanium	658.8	1309.8	2652.5	4174.6	9581	11533	13590	16440	18530	20833
23	V	vanadium	650.9	1414	2830	4507	6298.7	12363	14530	16730	19860	22240
24	Cr	chromium	652.9	1590.6	2987	4743	6702	8744.9	15455	17820	20190	23580
25	Mn	manganese	717.3	1509.0	3248	4940	6990	9220	11500	18770	21400	23960
26	Fe	iron	762.5	1561.9	2957	5290	7240	9560	12060	14580	22540	25290
27	Co	cobalt	760.4	1648	3232	4950	7670	9840	12440	15230	17959	26570
28	Ni	nickel	737.1	1753.0	3395	5300	7339	10400	12800	15600	18600	21670
29	Cu	copper	745.5	1957.9	3555	5536	7700	9900	13400	16000	19200	22400
30	Zn	zinc	906.4	1733.3	3833	5731	7970	10400	12900	16800	19600	23000
31	Ga	gallium	578.8	1979.3	2963	6180
32	Ge	germanium	762	1537.5	3302.1	4411	9020
33	As	arsenic	947.0	1798	2735	4837	6043	12310
34	Se	selenium	941.0	2045	2973.7	4144	6590	7880	14990
35	Br	bromine	1139.9	2103	3470	4560	5760	8550	9940	18600
36	Kr	krypton	1350.8	2350.4	3565	5070	6240	7570	10710	12138	22274	25880
37	Rb	rubidium	403.0	2633	3860	5080	6850	8140	9570	13120	14500	26740
38	Sr	strontium	549.5	1064.2	4138	5500	6910	8760	10230	11800	15600	17100
39	Y	yttrium	600	1180	1980	5847	7430	8970	11190	12450	14110	18400
40	Zr	zirconium	640.1	1270	2218	3313	7752	9500
41	Nb	niobium	652.1	1380	2416	3700	4877	9847	12100
42	Mo	molybdenum	684.3	1560	2618	4480	5257	6640.8	12125	13860	15835	17980
43	Tc	technetium	702	1470	2850
44	Ru	ruthenium	710.2	1620	2747
45	Rh	rhodium	719.7	1740	2997
46	Pd	palladium	804.4	1870	3177
47	Ag	silver	731.0	2070	3361
48	Cd	cadmium	867.8	1631.4	3616
49	In	indium	558.3	1820.7	2704	5210
50	Sn	tin	708.6	1411.8	2943.0	3930.3	7456
51	Sb	antimony	834	1594.9	2440	4260	5400	10400
52	Te	tellurium	869.3	1790	2698	3610	5668	6820	13200
53	I	iodine	1008.4	1845.9	3180
54	Xe	xenon	1170.4	2046.4	3099.4
55	Cs	caesium	375.7	2234.3	3400
56	Ba	barium	502.9	965.2	3600
57	La	lanthanum	538.1	1067	1850.3	4819	5940
58	Ce	cerium	534.4	1050	1949	3547	6325	7490
59	Pr	praseodymium	527	1020	2086	3761	5551
60	Nd	neodymium	533.1	1040	2130	3900
61	Pm	promethium	540	1050	2150	3970
62	Sm	samarium	544.5	1070	2260	3990
63	Eu	europium	547.1	1085	2404	4120
64	Gd	gadolinium	593.4	1170	1990	4250
65	Tb	terbium	565.8	1110	2114	3839
66	Dy	dysprosium	573.0	1130	2200	3990
67	Ho	holmium	581.0	1140	2204	4100
68	Er	erbium	589.3	1150	2194	4120
69	Tm	thulium	596.7	1160	2285	4120
70	Yb	ytterbium	603.4	1174.8	2417	4203
71	Lu	lutetium	523.5	1340	2022.3	4370	6445
72	Hf	hafnium	658.5	1440	2250	3216
73	Ta	tantalum	761	1500
74	W	tungsten	770	1700
75	Re	rhenium	760	1260	2510	3640
76	Os	osmium	840	1600
77	Ir	iridium	880	1600
78	Pt	platinum	870	1791
79	Au	gold	890.1	1980
80	Hg	mercury	1007.1	1810	3300
81	Tl	thallium	589.4	1971	2878
82	Pb	lead	715.6	1450.5	3081.5	4083	6640
83	Bi	bismuth	703	1610	2466	4370	5400	8520
84	Po	polonium	812.1
85	At	astatine	890±40
86	Rn	radon	1037
87	Fr	francium	380
88	Ra	radium	509.3	979.0
89	Ac	actinium	499	1170
90	Th	thorium	587	1110	1930	2780
91	Pa	protactinium	568
92	U	uranium	597.6	1420
93	Np	neptunium	604.5
94	Pu	plutonium	584.7
95	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
103	Lr	lawrencium	470
104	Rf	rutherfordium	580

11th–20th

number	symbol	name	11th	12th	13th	14th	15th	16th	17th	18th	19th	20th
11	Na	sodium	159076
12	Mg	magnesium	169988	189368
13	Al	aluminium	42647	201266	222316
14	Si	silicon	45962	50502	235196	257923
15	P	phosphorus	46261	54110	59024	271791	296195
16	S	sulfur	48710	54460	62930	68216	311048	337138
17	Cl	chlorine	51068	57119	63363	72341	78095	352994	380760
18	Ar	argon	52002	59653	66199	72918	82473	88576	397605	427066
19	K	potassium	54490	60730	68950	75900	83080	93400	99710	444880	476063
20	Ca	calcium	57110	63410	70110	78890	86310	94000	104900	111711	494850	527762
21	Sc	scandium	24102	66320	73010	80160	89490	97400	105600	117000	124270	547530
22	Ti	titanium	25575	28125	76015	83280	90880	100700	109100	117800	129900	137530
23	V	vanadium	24670	29730	32446	86450	94170	102300	112700	121600	130700	143400
24	Cr	chromium	26130	28750	34230	37066	97510	105800	114300	125300	134700	144300
25	Mn	manganese	27590	30330	33150	38880	41987	109480	118100	127100	138600	148500
26	Fe	iron	28000	31920	34830	37840	44100	47206	122200	131000	140500	152600
27	Co	cobalt	29400	32400	36600	39700	42800	49396	52737	134810	145170	154700
28	Ni	nickel	30970	34000	37100	41500	44800	48100	55101	58570	148700	159000
29	Cu	copper	25600	35600	38700	42000	46700	50200	53700	61100	64702	163700
30	Zn	zinc	26400	29990	40490	43800	47300	52300	55900	59700	67300	71200
36	Kr	krypton	29700	33800	37700	43100	47500	52200	57100	61800	75800	80400
38	Sr	strontium	31270
39	Y	yttrium	19900	36090
42	Mo	molybdenum	20190	22219	26930	29196	52490	55000	61400	67700	74000	80400

21st–30th

number	symbol	name	21st	22nd	23rd	24th	25th	26th	27th	28th	29th	30th
21	Sc	scandium	582163
22	Ti	titanium	602930	639294
23	V	vanadium	151440	661050	699144
24	Cr	chromium	157700	166090	721870	761733
25	Mn	manganese	158600	172500	181380	785450	827067
26	Fe	iron	163000	173600	188100	195200	851800	895161
27	Co	cobalt	167400	178100	189300	204500	214100	920870	966023
28	Ni	nickel	169400	182700	194000	205600	221400	231490	992718	1039668
29	Cu	copper	174100	184900	198800	210500	222700	239100	249660	1067358	1116105
30	Zn	zinc	179100
36	Kr	krypton	85300	90400	96300	101400	111100	116290	282500	296200	311400	326200
42	Mo	molybdenum	87000	93400	98420	104400	121900	127700	133800	139800	148100	154500

References

Ionization energies of the elements (data page)

Category: Chemical elements

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ionization_energies_of_the_elements". A list of authors is available in Wikipedia.

Encyclopedia of Chemistry

Contents

1st–10th

11th–20th

21st–30th

References