**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 | Ionization energy of Hydrogen (H) |
13.59 eV | – | – |

2 | Ionization energy of Helium (He) |
24.58 eV | 54.41 eV | – |

3 | Ionization energy of Lithium (Li) |
5.39 eV | 75.64 eV | 122.45 eV |

4 | Ionization energy of Beryllium (Be) |
9.32 eV | 18.21 eV | 153.89 eV |

5 | Ionization energy of Boron (B) |
8.29 eV | 25.15 eV | 37.93 eV |

6 | Ionization energy of Carbon (C) |
11.26 eV | 24.38 eV | 47.88 eV |

7 | Ionization energy of Nitrogen (N) |
14.53 eV | 29.60 eV | 47.44 eV |

8 | Ionization energy of Oxygen (O) |
13.61 eV | 35.11 eV | 54.93 eV |

9 | Ionization energy of Fluorine (F) |
17.42 eV | 34.97 eV | 62.70 eV |

10 | Ionization energy of Neon (Ne) |
21.56 eV | 40.96 eV | 63.45 eV |

11 | Ionization energy of Sodium (Na) |
5.13 eV | 47.28 eV | 71.62 eV |

12 | Ionization energy of Magnesium (Mg) |
7.64 eV | 15.03 eV | 80.14 eV |

13 | Ionization energy of Aluminum (Al) |
5.98 eV | 18.82 eV | 28.44 eV |

14 | Ionization energy of Silicon (Si) |
8.15 eV | 16.34 eV | 33.49 eV |

15 | Ionization energy of Phosphorus (P) |
10.48 eV | 19.76 eV | 30.20 eV |

16 | Ionization energy of Sulfur (S) |
10.36 eV | 23.33 eV | 34.79 eV |

17 | Ionization energy of Chlorine (Cl) |
12.96 eV | 23.81 eV | 39.61 eV |

18 | Ionization energy of Argon (Ar) |
15.75 eV | 27.62 eV | 40.74 eV |

19 | Ionization energy of Potassium (K) |
4.34 eV | 31.63 eV | 45.80 eV |

20 | Ionization energy of Calcium (Ca) |
6.11 eV | 11.87 eV | 50.91 eV |

21 | Ionization energy of Scandium (Sc) |
6.56 eV | 12.79 eV | 24.75 eV |

22 | Ionization energy of Titanium (Ti) |
6.82 eV | 13.57 eV | 27.49 eV |

23 | Ionization energy of Vanadium (V) |
6.74 eV | 14.66 eV | 29.31 eV |

24 | Ionization energy of Chromium (Cr) |
6.76 eV | 16.48 eV | 30.96 eV |

25 | Ionization energy of Manganese (Mn) |
7.43 eV | 15.63 eV | 33.66 eV |

26 | Ionization energy of Iron (Fe) |
7.90 eV | 16.18 eV | 30.65 eV |

27 | Ionization energy of Cobalt (Co) |
7.88 eV | 17.08 eV | 33.50 eV |

28 | Ionization energy of Nickel (Ni) |
7.63 eV | 18.16 eV | 35.19 eV |

29 | Ionization energy of Copper (Cu) |
7.72 eV | 20.29 eV | 36.84 eV |

30 | Ionization energy of Zinc (Zn) |
9.39 eV | 17.96 eV | 39.72 eV |

31 | Ionization energy of Gallium (Ga) |
5.99 eV | 20.51 eV | 30.71 eV |

32 | Ionization energy of Germanium (Ge) |
7.89 eV | 15.93 eV | 34.22 eV |

33 | Ionization energy of Arsenic (As) |
9.78 eV | 18.63 eV | 28.35 eV |

34 | Ionization energy of Selenium (Se) |
9.75 eV | 21.19 eV | 30.82 eV |

35 | Ionization energy of Bromine (Br) |
11.81 eV | 21.8 eV | 36 eV |

36 | Ionization energy of Krypton (Kr) |
13.99 eV | 24.35 eV | 36.95 eV |

37 | Ionization energy of Rubidium (Rb) |
4.17 eV | 27.28 eV | 40 eV |

38 | Ionization energy of Strontium (Sr) |
5.69 eV | 11.03 eV | 42.89 eV |

39 | Ionization energy of Yttrium (Y) |
6.21 eV | 12.24 eV | 20.52 eV |

40 | Ionization energy of Zirconium (Zr) |
6.63 eV | 13.13 eV | 22.99 eV |

41 | Ionization energy of Niobium (Nb) |
6.75 eV | 14.32 eV | 25.04 eV |

42 | Ionization energy of Molybdenum (Mo) |
7.09 eV | 16.16 eV | 27.13 eV |

43 | Ionization energy of Technetium (Tc) |
7.28 eV | 15.26 eV | 29.54 eV |

44 | Ionization energy of Ruthenium (Ru) |
7.36 eV | 16.76 eV | 28.47 eV |

45 | Ionization energy of Rhodium (Rh) |
7.45 eV | 18.08 eV | 31.06 eV |

46 | Ionization energy of Palladium (Pd) |
8.33 eV | 19.43 eV | 32.93 eV |

47 | Ionization energy of Silver (Ag) |
7.57 eV | 21.49 eV | 34.83 eV |

48 | Ionization energy of Cadmium (Cd) |
8.99 eV | 16.90 eV | 37.48 eV |

49 | Ionization energy of Indium (In) |
5.78 eV | 18.86 eV | 28.03 eV |

50 | Ionization energy of Tin (Sn) |
7.34 eV | 14.63 eV | 30.50 eV |

51 | Ionization energy of Antimony (Sb) |
8.60 eV | 16.53 eV | 25.3 eV |

52 | Ionization energy of Tellurium (Te) |
9 eV | 18.6 eV | 27.96 eV |

53 | Ionization energy of Iodine (I) |
10.45 eV | 19.13 eV | 33 eV |

54 | Ionization energy of Xenon (Xe) |
12.12 eV | 21.20 eV | 32.12 eV |

55 | Ionization energy of Cesium (Cs) |
3.89 eV | 23.15 eV | – |

56 | Ionization energy of Barium (Ba) |
5.21 eV | 10 eV | – |

57 | Ionization energy of Lanthanum (La) |
5.57 eV | 11.06 eV | 19.17 eV |

58 | Ionization energy of Cerium (Ce) |
5.53 eV | 10.85 eV | 20.19 eV |

59 | Ionization energy of Praseodymium (Pr) |
5.47 eV | 10.55 eV | 21.62 eV |

60 | Ionization energy of Neodymium (Nd) |
5.52 eV | 10.73 eV | 22.21 eV |

61 | Ionization energy of Promethium (Pm) |
5.58 eV | 10.9 eV | 22.3 eV |

62 | Ionization energy of Samarium (Sm) |
5.64 eV | 11.07 eV | 23.4 eV |

63 | Ionization energy of Europium (Eu) |
5.67 eV | 11.24 eV | 24.92 eV |

64 | Ionization energy of Gadolinium (Gd) |
6.15 eV | 12.09 eV | 20.63 eV |

65 | Ionization energy of Terbium (Tb) |
5.86 eV | 11.52 eV | 21.91 eV |

66 | Ionization energy of Dysprosium (Dy) |
5.93 eV | 11.67 eV | 22.8 eV |

67 | Ionization energy of Holmium (Ho) |
6.02 eV | 11.80 eV | 22.84 eV |

68 | Ionization energy of Erbium (Er) |
6.10 eV | 11.93 eV | 22.74 eV |

69 | Ionization energy of Thulium (Tm) |
6.18 eV | 12.05 eV | 23.63 eV |

70 | Ionization energy of Ytterbium (Yb) |
6.25 eV | 12.17 eV | 25.05 eV |

71 | Ionization energy of Lutetium (Lu) |
5.42 eV | 13.9 eV | 20.95 eV |

72 | Ionization energy of Hafnium (Hf) |
6.82 eV | 14.9 eV | 23.3 eV |

73 | Ionization energy of Tantalum (Ta) |
7.54 eV | – | – |

74 | Ionization energy of Tungsten (W) |
7.86 eV | – | – |

75 | Ionization energy of Rhenium (Re) |
7.83 eV | – | – |

76 | Ionization energy of Osmium (Os) |
8.43 eV | – | – |

77 | Ionization energy of Iridium (Ir) |
8.96 eV | – | – |

78 | Ionization energy of Platinum (Pt) |
8.95 eV | 18.56 eV | 28 eV |

79 | Ionization energy of Gold (Au) |
9.22 eV | 20.5 eV | 30 eV |

80 | Ionization energy of Mercury (Hg) |
10.43 v | 18.75 eV | 34.2 eV |

81 | Ionization energy of Thallium (Tl) |
6.10 eV | 20.42 eV | 29.83 eV |

82 | Ionization energy of Lead (Pb) |
7.41 eV | 15.03 eV | 31.93 eV |

83 | Ionization energy of Bismuth (Bi) |
7.28 eV | 16.69 eV | 25.56 eV |

84 | Ionization energy of Polonium (Po) |
8.41 eV | – | – |

85 | Ionization energy of Astatine (At) |
9.31 eV | – | – |

86 | Ionization energy of Radon (Rn) |
10.74 eV | – | – |

87 | Ionization energy of Francium (Fr) |
4.07 eV | – | – |

88 | Ionization energy of Radium (Ra) |
5.27 eV | 10.14 eV | – |

89 | Ionization energy of Actinium (Ac) |
5.17 eV | 12.1 eV | – |

90 | Ionization energy of Thorium (Th) |
6.30 eV | 11.5 eV | 20 eV |

91 | Ionization energy of Protactinium (Pa) |
5.89 eV | – | – |

92 | Ionization energy of Uranium (U) |
6.19 eV | – | – |

93 | Ionization energy of Neptunium (Np) |
6.26 eV | – | – |

94 | Ionization energy of Plutonium (Pu) |
6.02 eV | – | – |

95 | Ionization energy of Americium (Am) |
5.97 eV | – | – |

96 | Ionization energy of Curium (Cm) |
5.99 eV | – | – |

97 | Ionization energy of Berkelium (Bk) |
6.19 eV | – | – |

98 | Ionization energy of Californium (Cf) |
6.28 eV | – | – |

99 | Ionization energy of Einsteinium (Es) |
6.42 eV | – | – |

100 | Ionization energy of Fermium (Fm) |
6.50 v | – | – |

101 | Ionization energy of Mendelevium (Md) |
6.58 eV | – | – |

102 | Ionization energy of Nobelium (No) |
6.65 eV | – | – |

103 | Ionization energy of Lawrencium (Lr) |
4.9 eV | – | – |

104 | Ionization energy of Rutherfordium (Rf) |
6 eV | – | – |

105 | Ionization energy of Dubnium (Db) |
– | – | – |

106 | Ionization energy of Seaborgium (Sg) |
– | – | – |

107 | Ionization energy of Bohrium (Bh) |
– | – | – |

108 | Ionization energy of Hassium (Hs) |
– | – | – |

109 | Ionization energy of Meitnerium (Mt) |
– | – | – |

110 | Ionization energy of Darmstadtium (Ds) |
– | – | – |

111 | Ionization energy of Roentgenium (Rg) |
– | – | – |

112 | Ionization energy of Copernicium (Cn) |
– | – | – |

113 | Ionization energy of Nihonium (Nh) |
– | – | – |

114 | Ionization energy of Flerovium (Fl) |
– | – | – |

115 | Ionization energy of Moscovium (Mc) |
– | – | – |

116 | Ionization energy of Livermorium (Lv) |
– | – | – |

117 | Ionization energy of Tennessine (Ts) |
– | – | – |

118 | Ionization energy of Oganesson (Og) |
– | – | – |

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**References:**

Ionization energies of elements (Wikipedia)

NIST Atomic Spectra Database Ionization Energies Form