Ionization Energy Values
Ionization Energy
You can change the number of rows shown per page, you can change which rows are shown using "previous" and "next" (at the bottom of the table), or you can search for text in the table.
| Atom | Atomic No. | IE1 (kJ/mol) | IE2 (kJ/mol) | IE3 (kJ/mol) | IE4 (kJ/mol) | IE5 (kJ/mol) | IE6 (kJ/mol) | IE7 (kJ/mol) | IE8 (kJ/mol) | IE9 (kJ/mol) | IE10 (kJ/mol) | IE11 (kJ/mol) | IE12 (kJ/mol) | IE13 (kJ/mol) | IE14 (kJ/mol) | IE15 (kJ/mol) | IE16 (kJ/mol) | IE17 (kJ/mol) | IE18 (kJ/mol) | IE19 (kJ/mol) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| H | 1 | 1311.7 | ||||||||||||||||||
| He | 2 | 2371.6 | 5248.8 | |||||||||||||||||
| Li | 3 | 520.1 | 7296.1 | 11811.7 | ||||||||||||||||
| Be | 4 | 899.2 | 1756.6 | 14844.3 | 21000.7 | |||||||||||||||
| B | 5 | 800.4 | 2426.5 | 3658.7 | 25018.5 | 32817.3 | ||||||||||||||
| C | 6 | 1086.8 | 2351.9 | 4618.2 | 6221.0 | 37820.9 | 47262.4 | |||||||||||||
| N | 7 | 1402.9 | 2856.4 | 4575.9 | 7472.8 | 9442.3 | 53252.7 | 64339.3 | ||||||||||||
| O | 8 | 1313.6 | 3391.1 | 5300.3 | 7467.4 | 10987.1 | 13322.7 | 71313.7 | 84050.3 | |||||||||||
| F | 9 | 1681.0 | 3375.1 | 6050.4 | 8416.4 | 11020.0 | 15159.5 | 17863.2 | 92008.4 | |||||||||||
| Ne | 10 | 2080.1 | 3962.7 | 6175.1 | 9374.5 | 12195.7 | 15236.0 | |||||||||||||
| Na | 11 | 495.7 | 4562.8 | 6913.2 | 9540.5 | 13372.9 | 16630.2 | 20111.8 | 25487.1 | 28924.4 | ||||||||||
| Mg | 12 | 737.5 | 1450.2 | 7730.4 | 10544.9 | 13626.6 | 18029.3 | 21739.1 | 25661.0 | 31637.5 | 35444.9 | 169932.9 | ||||||||
| Al | 13 | 577.4 | 1816.1 | 2744.0 | 11574.4 | 14836.6 | 18372.7 | 23342.7 | 27510.9 | 31849.8 | 38449.4 | 42636.9 | 201216.3 | |||||||
| Si | 14 | 786.3 | 1576.6 | 3228.4 | 4354.4 | 16087.0 | 19790.1 | 23775.0 | 29319.0 | 33946.4 | 38719.6 | 45927.0 | 50481.1 | |||||||
| P | 15 | 1011.8 | 1895.9 | 2909.6 | 4954.9 | 6272.2 | 21266.7 | 25405.6 | 29839.1 | 35952.4 | 41050.7 | 46255.1 | 54060.7 | 58996.0 | ||||||
| S | 16 | 999.3 | 2257.8 | 3377.0 | 4562.8 | 6995.2 | 8493.5 | 27111.4 | 31724.4 | 36563.1 | 43244.7 | |||||||||
| Cl | 17 | 1255.3 | 2296.4 | 3849.8 | 5162.0 | 6541.7 | 9330.1 | 11025.4 | 33605.8 | 38661.7 | 43929.8 | |||||||||
| Ar | 18 | 1520.1 | 2664.9 | 3946.3 | 5768.9 | 7236.4 | 8809.1 | 11964.2 | 13841.8 | 40620.3 | ||||||||||
| K | 19 | 418.6 | 3069.2 | 4438.3 | 5876.0 | 7975 | 9619.6 | 11385.3 | 14955.2 | 16975.6 | 48609.3 | |||||||||
| Ca | 20 | 589.6 | 1145.3 | 4941.0 | 6464.5 | 8142.4 | 10496 | 12350.1 | 14183.3 | 18139.2 | 20386.4 | 57100.0 | 63197.9 | |||||||
| Sc | 21 | 632.9 | 1243.7 | 2388.0 | 7130.3 | 8876.7 | 10719.5 | 13314 | 15341.2 | 17367.4 | 21757.4 | 24098.2 | 66246.8 | |||||||
| Ti | 22 | 659.0 | 1315.1 | 2715.1 | 4172.0 | 9629.2 | 11578.2 | 13585.1 | 18621.7 | 25665.1 | 28122.6 | 76069.0 | ||||||||
| V | 23 | 650.3 | 1370.1 | 2865.6 | 4631.3 | 6290.8 | 12437.0 | 14569.3 | 16759.5 | 29814.0 | 32447.1 | 86557.0 | ||||||||
| Cr | 24 | 652.5 | 1591.0 | 2986.2 | 4785.7 | 7043.4 | 8741.6 | 15543.8 | 17849.8 | 20223.3 | 34252.3 | 37069.7 | 97739.6 | |||||||
| Mn | 25 | 717.1 | 1509.0 | 3250.6 | 7332.9 | 11504.9 | 18911.1 | 21419.7 | 23928.4 | 38980.1 | 41971.1 | 109597.7 | ||||||||
| Fe | 26 | 762.2 | 1561.1 | 2956.3 | 14569.3 | 22674.1 | 25279.2 | 27980.7 | 34252.3 | 37629.3 | 44093.8 | 47181.3 | 122150.4 | |||||||
| Co | 27 | 758.4 | 1645.1 | 3231.3 | 29428.0 | 49400.5 | 52777.5 | 135368.9 | ||||||||||||
| Ni | 28 | 736.5 | 1751.2 | 3488.9 | 33769.9 | 43900.8 | 58566.6 | |||||||||||||
| Cu | 29 | 745.3 | 1957.7 | 3553.6 | 64741.7 | |||||||||||||||
| Zn | 30 | 906.1 | 1732.9 | 3830.5 | ||||||||||||||||
| Ga | 31 | 578.9 | 1981.8 | 2962.1 | 6194.4 | 8299 | 10874 | 13585 | ||||||||||||
| Ge | 32 | 760.3 | 1537.0 | 3300.8 | 4409.4 | 9011.7 | 11183 | 13981 | ||||||||||||
| As | 33 | 946.5 | 1949.0 | 2730.5 | 4833.9 | 6040.0 | 12301.9 | 14183 | ||||||||||||
| Se | 34 | 940.7 | 2074.4 | 3087.5 | 4139.2 | 7053.1 | 7882.9 | 14955.2 | ||||||||||||
| Br | 35 | 1142.4 | 2084.1 | 3463.8 | 18621.7 | |||||||||||||||
| Kr | 36 | 1350.4 | 2369.7 | 3560.3 | ||||||||||||||||
| Rb | 37 | 402.9 | 2653.3 | 3859.4 | 26726.4 | |||||||||||||||
| Sr | 38 | 549.2 | 1063.9 | 0.0 | 5499.7 | 31261.3 | ||||||||||||||
| Y | 39 | 627.2 | 1196.4 | 3762.9 | 7429.4 | 36085.5 | ||||||||||||||
| Zr | 40 | 670.6 | 1353.7 | 2392.8 | 3277.6 | 9552.0 | ||||||||||||||
| Nb | 41 | 653.2 | 1350.8 | 2711.2 | 3695.4 | 4824.3 | 9938.0 | 12060.7 | ||||||||||||
| Mo | 42 | 685.0 | 1558.2 | 2617.6 | 4476.9 | 5904.9 | 6561.0 | 12157.2 | 14762.3 | |||||||||||
| Tc | 43 | 702.4 | 1472.4 | 0.0 | ||||||||||||||||
| Ru | 44 | 710.5 | 1617.1 | 2746.0 | ||||||||||||||||
| Rh | 45 | 719.8 | 1743.5 | 2995.9 | ||||||||||||||||
| Pd | 46 | 803.7 | 1873.7 | 3176.3 | ||||||||||||||||
| Ag | 47 | 730.8 | 2072.5 | 3359.6 | ||||||||||||||||
| Cd | 48 | 867.5 | 1631.0 | 3615.3 | ||||||||||||||||
| In | 49 | 558.2 | 1819.7 | 2704.5 | 5248.8 | |||||||||||||||
| Sn | 50 | 708.4 | 1411.4 | 2941.8 | 3928.9 | 6975.9 | ||||||||||||||
| Sb | 51 | 833.5 | 1592.0 | 2441.1 | 3193.7 | 5403.2 | 10420.4 | |||||||||||||
| Te | 52 | 869.3 | 1794.6 | 2991.0 | 3666.4 | 5789.1 | 6946.9 | 13218.5 | ||||||||||||
| I | 53 | 1008.7 | 1841.9 | 0.0 | 16402.5 | |||||||||||||||
| Xe | 54 | 1170.1 | 2045.5 | 3097.2 | ||||||||||||||||
| Cs | 55 | 375.6 | 2421.8 | 0.0 | ||||||||||||||||
| Ba | 56 | 502.7 | 964.9 | 0.0 | ||||||||||||||||
| La | 57 | 538.1 | 1067.1 | 1850.3 | 4819.4 | |||||||||||||||
| Ce | 58 | 527.4 | 1046.9 | 1948.8 | 3546.6 | |||||||||||||||
| Pr | 59 | 523.1 | 1017.9 | 2086.4 | 3761.0 | 5550.8 | ||||||||||||||
| Nd | 60 | 529.6 | 1035.3 | 2132.3 | 3899.0 | 5789.1 | ||||||||||||||
| Pm | 61 | 535.9 | 1051.7 | 2151.6 | 3965.5 | 5952.2 | ||||||||||||||
| Sm | 62 | 543.3 | 1068.1 | 2257.8 | 3994.5 | 6045.8 | ||||||||||||||
| Eu | 63 | 546.7 | 1084.6 | 2404.4 | 4110.3 | 6100.8 | ||||||||||||||
| Gd | 64 | 592.5 | 1166.5 | 1990.5 | 4245.4 | 6248.4 | ||||||||||||||
| Tb | 65 | 564.6 | 1111.5 | 2114.0 | 3839.2 | 6412.4 | ||||||||||||||
| Dy | 66 | 571.9 | 1126.0 | 2199.9 | 4001.2 | 5989.8 | ||||||||||||||
| Ho | 67 | 580.6 | 1138.5 | 2203.7 | 4100.6 | 6168.3 | ||||||||||||||
| Er | 68 | 588.7 | 1151.1 | 2194.1 | 4115.1 | 6281.2 | ||||||||||||||
| Tm | 69 | 596.7 | 1162.6 | 2284.8 | 4119.0 | 6312.1 | ||||||||||||||
| Yb | 70 | 603.4 | 1175.6 | 2415.0 | 4220.3 | 6327.5 | ||||||||||||||
| Lu | 71 | 523.5 | 1341.1 | 2022.3 | 4360.2 | 6444.3 | ||||||||||||||
| Hf | 72 | 641.6 | 1437.6 | 2248.1 | 3215.9 | 6595.4 | ||||||||||||||
| Ta | 73 | 760.3 | 4657.6 | |||||||||||||||||
| W | 74 | 770.0 | ||||||||||||||||||
| Re | 75 | 759.3 | ||||||||||||||||||
| Os | 76 | 839.4 | ||||||||||||||||||
| Ir | 77 | 868.4 | ||||||||||||||||||
| Pt | 78 | 868.4 | 1790.8 | |||||||||||||||||
| Au | 79 | 889.6 | 1977.9 | |||||||||||||||||
| Hg | 80 | 1006.3 | 1809.2 | 3299.8 | ||||||||||||||||
| Tl | 81 | 589.1 | 1970.2 | 2875.3 | 4891.8 | |||||||||||||||
| Pb | 82 | 715.4 | 1450.0 | 3080.8 | 4082.3 | 6638.2 | ||||||||||||||
| Bi | 83 | 703.1 | 1609.4 | 2466.2 | 4370.8 | 5403.2 | 8519.7 | |||||||||||||
| Po | 84 | 813.4 | ||||||||||||||||||
| Rn | 86 | 1036.8 | ||||||||||||||||||
| Fr | 87 | 393.0 | ||||||||||||||||||
| Ra | 88 | 509.2 | 978.7 | |||||||||||||||||
| Ac | 89 | 498.8 | 1167.5 | |||||||||||||||||
| Th | 90 | 586.6 | ||||||||||||||||||
| Pa | 91 | 568.3 | ||||||||||||||||||
| U | 92 | 583.7 | ||||||||||||||||||
| Np | 93 | 597.2 | ||||||||||||||||||
| Pu | 94 | 584.7 | ||||||||||||||||||
| Am | 95 | 578.2 | ||||||||||||||||||
| Cm | 96 | 580.8 | ||||||||||||||||||
| Bk | 97 | 601.1 | ||||||||||||||||||
| Cf | 98 | 607.9 | ||||||||||||||||||
| Es | 99 | 619.4 | ||||||||||||||||||
| Fm | 100 | 627.2 | ||||||||||||||||||
| Md | 101 | 634.9 | ||||||||||||||||||
| No | 102 | 641.6 | ||||||||||||||||||
| Lr | 103 | 478.6 | ||||||||||||||||||
| C. E. Moore, Ionization Potentials and Limits Derived from the Analyses of Optical Spectra, NSRDS-NBS 34, National Bureau of Standards, Washington, DC, 1970. For elements 57-72, values were obtained from Martin, W. C.; Hagan, Lucy; Reader, Joseph; Sugar, Jack J. Phys. Chem. Ref. Data, 1974, 3, 771-779. For elements 59-73, fifth IEs came from Sugar, Jack J. Opt. Soc. Am. 1975, 65, 1366-1367. For Lr see C&EN, Volume 93 Issue 15 | p. 8 | News of The Week, Issue Date: April 13, 2015 | Web Date: April 9, 2015 Lawrencium Ionization Energy Measured. *Values for La, Hf, and Lr have been overwritten with more recent data |
||||||||||||||||||||
Comments
Please use this form to report any inconsistencies, errors, or other things you would like to change about this page. We appreciate your comments. 🙂 (Note that we cannot answer questions via the google form. If you have a question, please post it on Piazza.)
Please use this form to report any inconsistencies, errors, or other things you would like to change about this page. We appreciate your comments. 🙂 (Note that we cannot answer questions via the google form. If you have a question, please post it on Piazza.)
