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Chapter 35 Appendix J: Table of Ionization Energies

These tables list values of molar ionization energies, measured in kJ⋅mol−1. This is the energy per mole necessary to remove electrons from gaseous atoms or atomic ions. The first molar ionization energy applies to the neutral atoms. The second, third, etc., molar ionization energy applies to the further removal of an electron from a singly, doubly, etc., charged ion. For ionization energies measured in the unit eV, see Ionization energies of the elements (data page). All data from rutherfordium onwards is predicted.

Molar Ionization Energies of the Elements
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 11,815.0
4 Be beryllium 899.5 1757.1 14,848.7 21,006.6
5 B boron 800.6 2427.1 3659.7 25,025.8 32,826.7
6 C carbon 1086.5 2352.6 4620.5 6222.7 37,831 47,277.0
7 N nitrogen 1402.3 2856 4578.1 7475.0 9444.9 53,266.6 64,360
8 O oxygen 1313.9 3388.3 5300.5 7469.2 10,989.5 13,326.5 71,330 84,078.0
9 F fluorine 1681.0 3374.2 6050.4 8407.7 11,022.7 15,164.1 17,868 92,038.1 106,434.3
10 Ne neon 2080.7 3952.3 6122 9371 12,177 15,238 19,999.0 23,069.5 115,379.5 131,432
11 Na sodium 495.8 4562 6910.3 9543 13,354 16,613 20,117 25,496 28,932 141,362
12 Mg magnesium 737.7 1450.7 7732.7 10,542.5 13,630 18,020 21,711 25,661 31,653 35,458
13 Al aluminium 577.5 1816.7 2744.8 11,577 14,842 18,379 23,326 27,465 31,853 38,473
14 Si silicon 786.5 1577.1 3231.6 4355.5 16,091 19,805 23,780 29,287 33,878 38,726
15 P phosphorus 1011.8 1907 2914.1 4963.6 6273.9 21,267 25,431 29,872 35,905 40,950
16 S sulfur 999.6 2252 3357 4556 7004.3 8495.8 27,107 31,719 36,621 43,177
17 Cl chlorine 1251.2 2298 3822 5158.6 6542 9362 11,018 33,604 38,600 43,961
18 Ar argon 1520.6 2665.8 3931 5771 7238 8781 11,995 13,842 40,760 46,186
19 K potassium 418.8 3052 4420 5877 7975 9590 11,343 14,944 16,963.7 48,610
20 Ca calcium 589.8 1145.4 4912.4 6491 8153 10,496 12,270 14,206 18,191 20,385
21 Sc scandium 633.1 1235.0 2388.6 7090.6 8843 10,679 13,310 15,250 17,370 21,726
22 Ti titanium 658.8 1309.8 2652.5 4174.6 9581 11,533 13,590 16,440 18,530 20,833
23 V vanadium 650.9 1414 2830 4507 6298.7 12,363 14,530 16,730 19,860 22,240
24 Cr chromium 652.9 1590.6 2987 4743 6702 8744.9 15,455 17,820 20,190 23,580
25 Mn manganese 717.3 1509.0 3248 4940 6990 9220 11,500 18,770 21,400 23,960
26 Fe iron 762.5 1561.9 2957 5290 7240 9560 12,060 14,580 22,540 25,290
27 Co cobalt 760.4 1648 3232 4950 7670 9840 12,440 15,230 17,959 26,570
28 Ni nickel 737.1 1753.0 3395 5300 7339 10,400 12,800 15,600 18,600 21,670
29 Cu copper 745.5 1957.9 3555 5536 7700 9900 13,400 16,000 19,200 22,400
30 Zn zinc 906.4 1733.3 3833 5731 7970 10,400 12,900 16,800 19,600 23,000
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 12,310
34 Se selenium 941.0 2045 2973.7 4144 6590 7880 14,990
35 Br bromine 1139.9 2103 3470 4560 5760 8550 9940 18,600
36 Kr krypton 1350.8 2350.4 3565 5070 6240 7570 10,710 12,138 22,274 25,880
37 Rb rubidium 403.0 2633 3860 5080 6850 8140 9570 13,120 14,500 26,740
38 Sr strontium 549.5 1064.2 4138 5500 6910 8760 10,230 11,800 15,600 17,100
39 Y yttrium 600 1180 1980 5847 7430 8970 11,190 12,450 14,110 18,400
40 Zr zirconium 640.1 1270 2218 3313 7752 9500
41 Nb niobium 652.1 1380 2416 3700 4877 9847 12,100
42 Mo molybdenum 684.3 1560 2618 4480 5257 6640.8 12,125 13,860 15,835 17,980
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 10,400
52 Te tellurium 869.3 1790 2698 3610 5668 6820 13,200
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 899.003
86 Rn radon 1037
87 Fr francium 380
88 Ra radium 509.3 979.0
89 Ac actinium 499 1170 1900 4700
90 Th thorium 587 1110 1978 2780
91 Pa protactinium 568 1128 1814 2991
92 U uranium 597.6 1420 1900 3145
93 Np neptunium 604.5 1128 1997 3242
94 Pu plutonium 584.7 1128 2084 3338
95 Am americium 578 1158 2132 3493
96 Cm curium 581 1196 2026 3550
97 Bk berkelium 601 1186 2152 3434
98 Cf californium 608 1206 2267 3599
99 Es einsteinium 619 1216 2334 3734
100 Fm fermium 627 1225 2363 3792
101 Md mendelevium 635 1235 2470 3840
102 No nobelium 642 1254 2643 3956
103 Lr lawrencium 470 1428 2228 4910
104 Rf rutherfordium 580 1390 2300 3080
105 Db dubnium 665 1547 2378 3299 4305
106 Sg seaborgium 757 1733 2484 3416 4562 5716
107 Bh bohrium 740 1690 2570 3600 4730 5990 7230
108 Hs hassium 730 1760 2830 3640 4940 6180 7540 8860
109 Mt meitnerium 800 1820 2900 3900 4900
110 Ds darmstadtium 960 1890 3030 4000 5100
111 Rg roentgenium 1020 2070 3080 4100 5300
112 Cn copernicium 1155 2170 3160 4200 5500
113 Nh nihonium 707.2 2309 3226 4382 5638
114 Fl flerovium 832.2 1600 3370 4400 5850
115 Mc moscovium 538.3 1760 2650 4680 5720
116 Lv livermorium 663.9 1330 2850 3810 6080
117 Ts tennessine 736.9 1435.4 2161.9 4012.9 5076.4
118 Og oganesson 860.1 1560
119 Uue ununennium 462.0 1700
120 Ubn unbinilium 563.3 895–
 919
121 Ubu unbiunium 300 1110 1710 4270
122 Ubb unbibium 540 1090 1848 2520

Source of data: Wikipedia https://en.wikipedia.org/wiki/Molar_ionization_energies_of_the_elements.