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Ionization Energies of the elements

Text lists sorted by: Value | Atomic Number | Alphabetical
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Key to values:
1
375.7, 2234.3, 3.4×103 kJ/mol
2
380 kJ/mol
3
403, 2633, 3860, 5080, 6850, 8140, 9570, 13120, 1.45×104, 26740 kJ/mol
4
418.8, 3052, 4420, 5877, 7975, 9590, 11343, 14944, 16963.7, 48610 kJ/mol
5
495.8, 4562, 6910.3, 9543, 13354, 16613, 20117, 25496, 28932, 141362 kJ/mol
6
499, 1170 kJ/mol
7
502.9, 965.2, 3.6×103 kJ/mol
8
509.3, 979 kJ/mol
9
520.2, 7298.1, 11815 kJ/mol
10
523.5, 1340, 2022.3, 4370, 6445 kJ/mol
11
527, 1020, 2086, 3761, 5551 kJ/mol
12
533.1, 1040, 2130, 3.9×103 kJ/mol
13
534.4, 1050, 1949, 3547, 6325, 7490 kJ/mol
14
538.1, 1067, 1850.3, 4819, 5940 kJ/mol
15
540, 1050, 2150, 3970 kJ/mol
16
544.5, 1070, 2260, 3990 kJ/mol
17
547.1, 1085, 2404, 4120 kJ/mol
18
549.5, 1064.2, 4138, 5.5×103, 6910, 8760, 10230, 1.18×104, 1.56×104, 1.71×104 kJ/mol
19
558.3, 1820.7, 2704, 5210 kJ/mol
20
565.8, 1110, 2114, 3839 kJ/mol
21
568 kJ/mol
22
573, 1130, 2.2×103, 3990 kJ/mol
23
577.5, 1816.7, 2744.8, 11577, 14842, 18379, 23326, 27465, 31853, 38473 kJ/mol
24
578 kJ/mol
25
578.8, 1979.3, 2963, 6180 kJ/mol
26
581 kJ/mol
27
581, 1140, 2204, 4.1×103 kJ/mol
28
584.7 kJ/mol
29
587, 1110, 1930, 2780 kJ/mol
30
589.3, 1150, 2194, 4120 kJ/mol
31
589.4, 1971, 2878 kJ/mol
32
589.8, 1145.4, 4912.4, 6491, 8153, 10496, 12270, 14206, 18191, 20385, 57110 kJ/mol
33
593.4, 1170, 1990, 4250 kJ/mol
34
596.7, 1160, 2285, 4120 kJ/mol
35
597.6, 1420 kJ/mol
36
600, 1180, 1980, 5847, 7430, 8970, 11190, 12450, 14110, 1.84×104 kJ/mol
37
601 kJ/mol
38
603.4, 1174.8, 2417, 4203 kJ/mol
39
604.5 kJ/mol
40
608 kJ/mol
41
619 kJ/mol
42
627 kJ/mol
43
633.1, 1235, 2388.6, 7090.6, 8843, 10679, 13310, 15250, 17370, 21726, 24102, 66320, 73010, 80160, 89490, 9.74×104, 1.056×105, 1.17×105, 124270, 547530, 582163 kJ/mol
44
635 kJ/mol
45
640.1, 1270, 2218, 3313, 7752, 9.5×103 kJ/mol
46
642 kJ/mol
47
650.9, 1414, 2830, 4507, 6298.7, 12363, 14530, 16730, 19860, 22240, 24670, 29730, 32446, 86450, 94170, 1.023×105, 1.127×105, 1.216×105, 1.307×105, 1.434×105, 151440 kJ/mol
48
652.1, 1380, 2416, 3.7×103, 4877, 9847, 1.21×104 kJ/mol
49
652.9, 1590.6, 2987, 4743, 6702, 8744.9, 15455, 17820, 20190, 23580, 26130, 28750, 34230, 37066, 97510, 1.058×105, 1.143×105, 1.253×105, 1.347×105, 1.443×105, 1.577×105 kJ/mol
50
658.5, 1440, 2250, 3216 kJ/mol
51
658.8, 1309.8, 2652.5, 4174.6, 9581, 11533, 13590, 16440, 18530, 20833, 25575, 28125, 76015, 83280, 90880, 1.007×105, 1.091×105, 1.178×105, 1.299×105, 137530, 602930 kJ/mol
52
684.3, 1560, 2618, 4480, 5257, 6640.8, 12125, 13860, 15835, 17980, 20190, 22219, 26930, 29196, 52490, 5.5×104, 6.14×104, 6.77×104, 7.4×104, 8.04×104, 8.7×104 kJ/mol
53
702, 1470, 2850 kJ/mol
54
703, 1610, 2466, 4370, 5.4×103, 8520 kJ/mol
55
708.6, 1411.8, 2943, 3930.3, 7456 kJ/mol
56
710.2, 1620, 2747 kJ/mol
57
715.6, 1450.5, 3081.5, 4083, 6640 kJ/mol
58
717.3, 1509, 3248, 4940, 6990, 9220, 1.15×104, 18770, 2.14×104, 23960, 27590, 30330, 33150, 38880, 41987, 109480, 1.181×105, 1.271×105, 1.386×105, 1.485×105, 1.586×105 kJ/mol
59
719.7, 1740, 2997 kJ/mol
60
731, 2070, 3361 kJ/mol
61
737.1, 1753, 3395, 5.3×103, 7339, 1.04×104, 1.28×104, 1.56×104, 1.86×104, 21670, 30970, 3.4×104, 3.71×104, 4.15×104, 4.48×104, 4.81×104, 55101, 58570, 1.487×105, 1.59×105, 1.694×105 kJ/mol
62
737.7, 1450.7, 7732.7, 10542.5, 13630, 18020, 21711, 25661, 31653, 35458 kJ/mol
63
745.5, 1957.9, 3555, 5536, 7.7×103, 9.9×103, 1.34×104, 1.6×104, 1.92×104, 2.24×104, 2.56×104, 3.56×104, 3.87×104, 4.2×104, 4.67×104, 5.02×104, 5.37×104, 6.11×104, 64702, 1.637×105, 1.741×105 kJ/mol
64
760, 1260, 2510, 3640 kJ/mol
65
760.4, 1648, 3232, 4950, 7670, 9840, 12440, 15230, 17959, 26570, 2.94×104, 3.24×104, 3.66×104, 3.97×104, 4.28×104, 49396, 52737, 134810, 145170, 1.547×105, 1.674×105 kJ/mol
66
761, 1.5×103 kJ/mol
67
762, 1537.5, 3302.1, 4411, 9020 kJ/mol
68
762.5, 1561.9, 2957, 5290, 7240, 9560, 12060, 14580, 22540, 25290, 2.8×104, 31920, 34830, 37840, 4.41×104, 47206, 1.222×105, 1.31×105, 1.405×105, 1.526×105, 1.63×105 kJ/mol
69
770, 1.7×103 kJ/mol
70
786.5, 1577.1, 3231.6, 4355.5, 16091, 19805, 23780, 29287, 33878, 38726 kJ/mol
71
800.6, 2427.1, 3659.7, 25025.8, 32826.7 kJ/mol
72
804.4, 1870, 3177 kJ/mol
73
812.1 kJ/mol
74
834, 1594.9, 2440, 4260, 5.4×103, 1.04×104 kJ/mol
75
840, 1.6×103 kJ/mol
76
867.8, 1631.4, 3616 kJ/mol
77
869.3, 1790, 2698, 3610, 5668, 6820, 1.32×104 kJ/mol
78
870, 1791 kJ/mol
79
880, 1.6×103 kJ/mol
80
890.1, 1980 kJ/mol
81
899.5, 1757.1, 14848.7, 21006.6 kJ/mol
82
906.4, 1733.3, 3833, 5731, 7970, 1.04×104, 1.29×104, 1.68×104, 1.96×104, 2.3×104, 2.64×104, 29990, 40490, 4.38×104, 4.73×104, 5.23×104, 5.59×104, 5.97×104, 6.73×104, 7.12×104, 1.791×105 kJ/mol
83
920 kJ/mol
84
941, 2045, 2973.7, 4144, 6590, 7880, 14990 kJ/mol
85
947, 1798, 2735, 4837, 6043, 12310 kJ/mol
86
999.6, 2252, 3357, 4556, 7004.3, 8495.8, 27107, 31719, 36621, 43177 kJ/mol
87
1007.1, 1810, 3.3×103 kJ/mol
88
1008.4, 1845.9, 3180 kJ/mol
89
1011.8, 1907, 2914.1, 4963.6, 6273.9, 21267, 25431, 29872, 35905, 40950 kJ/mol
90
1037 kJ/mol
91
1086.5, 2352.6, 4620.5, 6222.7, 37831, 47277 kJ/mol
92
1139.9, 2103, 3470, 4560, 5760, 8550, 9940, 1.86×104 kJ/mol
93
1170.4, 2046.4, 3099.4 kJ/mol
94
1251.2, 2298, 3822, 5158.6, 6542, 9362, 11018, 33604, 3.86×104, 43961 kJ/mol
95
1312 kJ/mol
96
1313.9, 3388.3, 5300.5, 7469.2, 10989.5, 13326.5, 71330, 84078 kJ/mol
97
1350.8, 2350.4, 3565, 5070, 6240, 7570, 10710, 12138, 22274, 25880, 2.97×104, 3.38×104, 3.77×104, 4.31×104, 4.75×104, 5.22×104, 5.71×104, 6.18×104, 7.58×104, 8.04×104, 8.53×104 kJ/mol
98
1402.3, 2856, 4578.1, 7475, 9444.9, 53266.6, 64360 kJ/mol
99
1520.6, 2665.8, 3931, 5771, 7238, 8781, 11995, 13842, 40760, 46186 kJ/mol
100
1681, 3374.2, 6050.4, 8407.7, 11022.7, 15164.1, 17868, 92038.1, 106434.3 kJ/mol
101
2080.7, 3952.3, 6122, 9371, 12177, 15238, 19999, 23069.5, 115379.5, 131432 kJ/mol
102
2372.3, 5250.5 kJ/mol
103N/A


Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc.

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Absolute Boiling Point Isotope Abundances
Absolute Melting Point Known Isotopes
Abundance in Earth's Crust Lattice Angles
Abundance in Humans Lattice Constants
Abundance in Meteorites Lifetime
Abundance in the Ocean Liquid Density
Abundance in the Sun Magnetic Type
Abundance in the Universe Mass Magnetic Susceptibility
Adiabatic Index Melting Point
Allotrope Names Memberships
Alternate Names Mohs Hardness
Atomic Number Molar Magnetic Susceptibility
Atomic Radius Molar Volume
Atomic Weight Name
Autoignition Point Neel Point
Block Neutron Cross Section
Boiling Point Neutron Mass Absorption
Brinell Hardness NFPA Fire Rating
Bulk Modulus NFPA Hazards
CAS Number NFPA Health Rating
CID Number NFPA Label
Color NFPA Reactivity Rating
Covalent Radius NSC Number
Critical Pressure Period
Critical Temperature Phase
Crystal Structure Poisson Ratio
Curie Point Quantum Numbers
Decay Mode Radioactive
Density Refractive Index
Discovery Year Resistivity
DOT Hazard Class RTECS Classes
DOT Numbers RTECS Number
Electrical Conductivity Shear Modulus
Electrical Type Space Group Name
Electron Affinity Space Group Number
Electron Configuration Specific Heat
Electronegativity Speed of Sound
EU Number Stable Isotopes
Flash Point Superconducting Point
Gas Atomic Multiplicities Symbol
Gmelin Number Thermal Conductivity
Group Thermal Expansion
Half Life Valence
Heat of Combustion Van Der Waals Radius
Heat of Fusion Vickers Hardness
Heat of Vaporization Volume Magnetic Susceptibility
Ionization Energies Young Modulus