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