Ionization energy chart of all the elements is given below.
First ionization energy, second ionization energy as well as third ionization energy of the elements are given in this chart.
Note: The ionization energy is measured in joules (J) or electron volts (eV). The values mentioned in the chart are given in electron volts (eV).
| Atomic no. | Element | First, Second and Third Ionization Energy (eV) | ||
| First Ionization Energy | Second Ionization Energy | Third Ionization Energy | ||
| 1 | Hydrogen (H) | 13.59 eV | – | – |
| 2 | Helium (He) | 24.58 eV | 54.41 eV | – |
| 3 | Lithium (Li) | 5.39 eV | 75.64 eV | 122.45 eV |
| 4 | Beryllium (Be) | 9.32 eV | 18.21 eV | 153.89 eV |
| 5 | Boron (B) | 8.29 eV | 25.15 eV | 37.93 eV |
| 6 | Carbon (C) | 11.26 eV | 24.38 eV | 47.88 eV |
| 7 | Nitrogen (N) | 14.53 eV | 29.60 eV | 47.44 eV |
| 8 | Oxygen (O) | 13.61 eV | 35.11 eV | 54.93 eV |
| 9 | Fluorine (F) | 17.42 eV | 34.97 eV | 62.70 eV |
| 10 | Neon (Ne) | 21.56 eV | 40.96 eV | 63.45 eV |
| 11 | Sodium (Na) | 5.13 eV | 47.28 eV | 71.62 eV |
| 12 | Magnesium (Mg) | 7.64 eV | 15.03 eV | 80.14 eV |
| 13 | Aluminum (Al) | 5.98 eV | 18.82 eV | 28.44 eV |
| 14 | Silicon (Si) | 8.15 eV | 16.34 eV | 33.49 eV |
| 15 | Phosphorus (P) | 10.48 eV | 19.76 eV | 30.20 eV |
| 16 | Sulfur (S) | 10.36 eV | 23.33 eV | 34.79 eV |
| 17 | Chlorine (Cl) | 12.96 eV | 23.81 eV | 39.61 eV |
| 18 | Argon (Ar) | 15.75 eV | 27.62 eV | 40.74 eV |
| 19 | Potassium (K) | 4.34 eV | 31.63 eV | 45.80 eV |
| 20 | Calcium (Ca) | 6.11 eV | 11.87 eV | 50.91 eV |
| 21 | Scandium (Sc) | 6.56 eV | 12.79 eV | 24.75 eV |
| 22 | Titanium (Ti) | 6.82 eV | 13.57 eV | 27.49 eV |
| 23 | Vanadium (V) | 6.74 eV | 14.66 eV | 29.31 eV |
| 24 | Chromium (Cr) | 6.76 eV | 16.48 eV | 30.96 eV |
| 25 | Manganese (Mn) | 7.43 eV | 15.63 eV | 33.66 eV |
| 26 | Iron (Fe) | 7.90 eV | 16.18 eV | 30.65 eV |
| 27 | Cobalt (Co) | 7.88 eV | 17.08 eV | 33.50 eV |
| 28 | Nickel (Ni) | 7.63 eV | 18.16 eV | 35.19 eV |
| 29 | Copper (Cu) | 7.72 eV | 20.29 eV | 36.84 eV |
| 30 | Zinc (Zn) | 9.39 eV | 17.96 eV | 39.72 eV |
| 31 | Gallium (Ga) | 5.99 eV | 20.51 eV | 30.71 eV |
| 32 | Germanium (Ge) | 7.89 eV | 15.93 eV | 34.22 eV |
| 33 | Arsenic (As) | 9.78 eV | 18.63 eV | 28.35 eV |
| 34 | Selenium (Se) | 9.75 eV | 21.19 eV | 30.82 eV |
| 35 | Bromine (Br) | 11.81 eV | 21.8 eV | 36 eV |
| 36 | Krypton (Kr) | 13.99 eV | 24.35 eV | 36.95 eV |
| 37 | Rubidium (Rb) | 4.17 eV | 27.28 eV | 40 eV |
| 38 | Strontium (Sr) | 5.69 eV | 11.03 eV | 42.89 eV |
| 39 | Yttrium (Y) | 6.21 eV | 12.24 eV | 20.52 eV |
| 40 | Zirconium (Zr) | 6.63 eV | 13.13 eV | 22.99 eV |
| 41 | Niobium (Nb) | 6.75 eV | 14.32 eV | 25.04 eV |
| 42 | Molybdenum (Mo) | 7.09 eV | 16.16 eV | 27.13 eV |
| 43 | Technetium (Tc) | 7.28 eV | 15.26 eV | 29.54 eV |
| 44 | Ruthenium (Ru) | 7.36 eV | 16.76 eV | 28.47 eV |
| 45 | Rhodium (Rh) | 7.45 eV | 18.08 eV | 31.06 eV |
| 46 | Palladium (Pd) | 8.33 eV | 19.43 eV | 32.93 eV |
| 47 | Silver (Ag) | 7.57 eV | 21.49 eV | 34.83 eV |
| 48 | Cadmium (Cd) | 8.99 eV | 16.90 eV | 37.48 eV |
| 49 | Indium (In) | 5.78 eV | 18.86 eV | 28.03 eV |
| 50 | Tin (Sn) | 7.34 eV | 14.63 eV | 30.50 eV |
| 51 | Antimony (Sb) | 8.60 eV | 16.53 eV | 25.3 eV |
| 52 | Tellurium (Te) | 9 eV | 18.6 eV | 27.96 eV |
| 53 | Iodine (I) | 10.45 eV | 19.13 eV | 33 eV |
| 54 | Xenon (Xe) | 12.12 eV | 21.20 eV | 32.12 eV |
| 55 | Cesium (Cs) | 3.89 eV | 23.15 eV | – |
| 56 | Barium (Ba) | 5.21 eV | 10 eV | – |
| 57 | Lanthanum (La) | 5.57 eV | 11.06 eV | 19.17 eV |
| 58 | Cerium (Ce) | 5.53 eV | 10.85 eV | 20.19 eV |
| 59 | Praseodymium (Pr) | 5.47 eV | 10.55 eV | 21.62 eV |
| 60 | Neodymium (Nd) | 5.52 eV | 10.73 eV | 22.21 eV |
| 61 | Promethium (Pm) | 5.58 eV | 10.9 eV | 22.3 eV |
| 62 | Samarium (Sm) | 5.64 eV | 11.07 eV | 23.4 eV |
| 63 | Europium (Eu) | 5.67 eV | 11.24 eV | 24.92 eV |
| 64 | Gadolinium (Gd) | 6.15 eV | 12.09 eV | 20.63 eV |
| 65 | Terbium (Tb) | 5.86 eV | 11.52 eV | 21.91 eV |
| 66 | Dysprosium (Dy) | 5.93 eV | 11.67 eV | 22.8 eV |
| 67 | Holmium (Ho) | 6.02 eV | 11.80 eV | 22.84 eV |
| 68 | Erbium (Er) | 6.10 eV | 11.93 eV | 22.74 eV |
| 69 | Thulium (Tm) | 6.18 eV | 12.05 eV | 23.63 eV |
| 70 | Ytterbium (Yb) | 6.25 eV | 12.17 eV | 25.05 eV |
| 71 | Lutetium (Lu) | 5.42 eV | 13.9 eV | 20.95 eV |
| 72 | Hafnium (Hf) | 6.82 eV | 14.9 eV | 23.3 eV |
| 73 | Tantalum (Ta) | 7.54 eV | – | – |
| 74 | Tungsten (W) | 7.86 eV | – | – |
| 75 | Rhenium (Re) | 7.83 eV | – | – |
| 76 | Osmium (Os) | 8.43 eV | – | – |
| 77 | Iridium (Ir) | 8.96 eV | – | – |
| 78 | Platinum (Pt) | 8.95 eV | 18.56 eV | 28 eV |
| 79 | Gold (Au) | 9.22 eV | 20.5 eV | 30 eV |
| 80 | Mercury (Hg) | 10.43 v | 18.75 eV | 34.2 eV |
| 81 | Thallium (Tl) | 6.10 eV | 20.42 eV | 29.83 eV |
| 82 | Lead (Pb) | 7.41 eV | 15.03 eV | 31.93 eV |
| 83 | Bismuth (Bi) | 7.28 eV | 16.69 eV | 25.56 eV |
| 84 | Polonium (Po) | 8.41 eV | – | – |
| 85 | Astatine (At) | 9.31 eV | – | – |
| 86 | Radon (Rn) | 10.74 eV | – | – |
| 87 | Francium (Fr) | 4.07 eV | – | – |
| 88 | Radium (Ra) | 5.27 eV | 10.14 eV | – |
| 89 | Actinium (Ac) | 5.17 eV | 12.1 eV | – |
| 90 | Thorium (Th) | 6.30 eV | 11.5 eV | 20 eV |
| 91 | Protactinium (Pa) | 5.89 eV | – | – |
| 92 | Uranium (U) | 6.19 eV | – | – |
| 93 | Neptunium (Np) | 6.26 eV | – | – |
| 94 | Plutonium (Pu) | 6.02 eV | – | – |
| 95 | Americium (Am) | 5.97 eV | – | – |
| 96 | Curium (Cm) | 5.99 eV | – | – |
| 97 | Berkelium (Bk) | 6.19 eV | – | – |
| 98 | Californium (Cf) | 6.28 eV | – | – |
| 99 | Einsteinium (Es) | 6.42 eV | – | – |
| 100 | Fermium (Fm) | 6.50 v | – | – |
| 101 | Mendelevium (Md) | 6.58 eV | – | – |
| 102 | Nobelium (No) | 6.65 eV | – | – |
| 103 | Lawrencium (Lr) | 4.9 eV | – | – |
| 104 | Rutherfordium (Rf) | 6 eV | – | – |
| 105 | Dubnium (Db) | – | – | – |
| 106 | Seaborgium (Sg) | – | – | – |
| 107 | Bohrium (Bh) | – | – | – |
| 108 | Hassium (Hs) | – | – | – |
| 109 | Meitnerium (Mt) | – | – | – |
| 110 | Darmstadtium (Ds) | – | – | – |
| 111 | Roentgenium (Rg) | – | – | – |
| 112 | Copernicium (Cn) | – | – | – |
| 113 | Nihonium (Nh) | – | – | – |
| 114 | Flerovium (Fl) | – | – | – |
| 115 | Moscovium (Mc) | – | – | – |
| 116 | Livermorium (Lv) | – | – | – |
| 117 | Tennessine (Ts) | – | – | – |
| 118 | Oganesson (Og) | – | – | – |
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References:
Ionization energies of elements (Wikipedia)
NIST Atomic Spectra Database Ionization Energies Form