| Element (kJ/mol) | First ionization potential (kJ/mol) | Second ionization potential (kJ/mol) | Third ionization potential (kJ/mol) |
| Hydrogen | 1312 | — | — |
| Helium | 2372.3 | 5250.4 | — |
| Lithium | 513.3 | 7298 | 11814.8 |
| Beryllium | 899.4 | 1757.1 | 14848 |
| Boron | 800.6 | 2427 | 3660 |
| Carbon | 1086.2 | 2352 | 4620 |
| Nitrogen | 1402.3 | 2856.1 | 4578 |
| Oxygen | 1313.9 | 3388.2 | 5300.3 |
| Fluorine | 1681 | 3374 | 6050 |
| Neon | 2080.6 | 3952.2 | 6122 |
| Sodium | 495.8 | 4562.4 | 6912 |
| Magnesium | 737.7 | 1450.7 | 7732.6 |
| Aluminum | 577.4 | 1816.6 | 2744.6 |
| Silicon | 786.5 | 1577.1 | 3231.4 |
| Phosphorus | 1011.7 | 1903.2 | 2912 |
| Sulfur | 999.6 | 2251 | 3361 |
| Chlorine | 1251.1 | 2297 | 3826 |
| Argon | 1520.4 | 2665.2 | 3928 |
| Potassium | 418.8 | 3051.4 | 4411 |
| Calcium | 589.7 | 1145 | 4910 |
| Scandium | 631 | 1235 | 2389 |
| Titanium | 658 | 1310 | 2652 |
| Vanadium | 650 | 1414 | 2828 |
| Chromium | 652.7 | 1592 | 2987 |
| Manganese | 717.4 | 1509 | 3248.4 |
| Iron | 759.3 | 1561 | 2957 |
| Cobalt | 760 | 1646 | 3232 |
| Nickel | 736.7 | 1753 | 3393 |
| Copper | 745.4 | 1958 | 3554 |
| Zinc | 906.4 | 1733.3 | 3832.6 |
| Gallium | 578.8 | 1979 | 2963 |
| Germanium | 762.1 | 1537 | 3302 |
| Arsenic | 947 | 1798 | 2735 |
| Selenium | 940.9 | 2044 | 2974 |
| Bromine | 1139.9 | 2104 | 3500 |
| Krypton | 1350.7 | 2350 | 3565 |
| Rubidium | 403 | 2632 | 3900 |
| Strontium | 549.5 | 1064.2 | 4210 |
| Yttrium | 616 | 1181 | 1980 |
| Zirconium | 660 | 1257 | 2218 |
| Niobium | 664 | 1382 | 2416 |
| Molybdenum | 685 | 1558 | 2621 |
| Technetium | 702 | 1472 | 2850 |
| Ruthenium | 711 | 1617 | 2747 |
| Rhodium | 720 | 1744 | 2997 |
| Palladium | 805 | 1875 | 3177 |
| Silver | 731 | 2073 | 3361 |
| Cadmium | 867.6 | 1631 | 3616 |
| Indium | 558.3 | 1820.6 | 2704 |
| Tin | 708.6 | 1411.8 | 2943 |
| Antimony | 833.7 | 1794 | 2443 |
| Tellurium | 869.2 | 1795 | 2698 |
| Iodine | 1008.4 | 1845.9 | 3200 |
| Xenon | 1170.4 | 2046 | 3097 |
| Cesium | 375.7 | 2420 | — |
| Barium | 502.8 | 965.1 | — |
| Lanthanum | 538.1 | 1067 | — |
| Cerium | 527.4 | 1047 | — |
| Praseodymium | 523.1 | 1018 | — |
| Neodymium | 529.6 | 1035 | — |
| Promethium | 535.9 | 1052 | — |
| Samarium | 543.9 | 1068 | — |
| Europium | 546.7 | 1085 | — |
| Gadolinium | 592.5 | 1167 | — |
| Terbium | 564.6 | 1112 | — |
| Dysprosium | 571.9 | 1126 | — |
| Holmium | 580.7 | 1139 | — |
| Erbium | 588.7 | 1151 | — |
| Thulium | 596.7 | 1163 | — |
| Ytterbium | 603.4 | 1176 | — |
| Lutetium | 523.5 | 1340 | — |
| Hafnium | 642 | 1440 | — |
| Tantalum | 761 | (1500) | — |
| Tungsten | 770 | (1700) | — |
| Rhenium | 760 | 1260 | — |
| Osmium | 840 | (1600) | — |
| Iridium | 880 | (1680) | — |
| Platinum | 870 | 1791 | — |
| Gold | 890.1 | 1980 | — |
| Mercury | 1007 | 1809.7 | — |
| Thallium | 589.3 | 1971 | — |
| Lead | 715.5 | 1450.4 | — |
| Bismuth | 703.2 | 1610 | — |
| Polonium | 812 | (1800) | — |
| Astatine | 930 | 1600 | — |
| Radon | 1037 | — | — |
| Francium | 400 | (2100) | — |
| Radium | 509.3 | 979 | — |
| Actinium | 499 | 1170 | — |
| Thorium | 587 | 1110 | — |
| Protactinium | 568 | — | — |
| Uranium | 584 | 1420 | — |
| Neptunium | 597 | — | — |
| Plutonium | 585 | — | — |
| Americium | 578.2 | — | — |
| Curium | 581 | — | — |
| Berkelium | 601 | — | — |
| Californium | 608 | — | — |
| Einsteinium | 619 | — | — |
| Fermium | 627 | — | — |
| Mendelevium | 635 | — | — |
| Nobelium | 642 | — | — |
Ionization Energies
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