Ionization Energy

Name chemical element

Symbol

Atomic number

3,8939

Cesium

Cs

55

4,0727

Francium

Fr

87

4,1771

Rubidium

Rb

37

4,3407

Potassium

K

19

4,9

Lawrencium

Lr

103

5,1391

Sodium

Na

11

5,17

Actinium

Ac

89

5,2117

Barium

Ba

56

5,2784

Radium

Ra

88

5,3917

Lithium

Li

3

5,4259

Lutetium

Lu

71

5,473

Praseodymium

Pr

59

5,525

Neodymium

Nd

60

5,5387

Cerium

Ce

58

5,5769

Lanthanum

La

57

5,582

Promethium

Pm

61

5,6437

Samarium

Sm

62

5,6704

Europium

Eu

63

5,6949

Strontium

Sr

38

5,7864

Indium

In

49

5,8638

Terbium

Tb

65

5,89

Protactinium

Pa

91

5,9389

Dysprosium

Dy

66

5,9738

Americium

Am

95

5,9858

Aluminum

Al

13

5,9915

Curium

Cm

96

5,9993

Gallium

Ga

31

6,0215

Holmium

Ho

67

6,0262

Plutonium

Pu

94

6,1077

Erbium

Er

68

6,1082

Thallium

Tl

81

6,1132

Calcium

Ca

20

6,1501

Gadolinium

Gd

64

6,1843

Thulium

Tm

69

6,1941

Uranium

U

92

6,1979

Berkelium

Bk

97

6,2173

Yttrium

Y

39

6,2542

Ytterbium

Yb

70

6,2657

Neptunium

Np

93

6,2817

Californium

Cf

98

6,3067

Thorium

Th

90

6,42

Einsteinium

Es

99

6,5

Fermium

Fm

100

6,5615

Scandium

Sc

21

6,58

Mendelevium

Md

101

6,6339

Zirconium

Zr

40

6,65

Nobelium

No

102

6,7462

Vanadium

V

23

6,7589

Niobium

Nb

41

6,7665

Chromium

Cr

24

6,8251

Hafnium

Hf

72

6,8281

Titanium

Ti

22

7,0924

Molybdenum

Mo

42

7,28

Technetium

Tc

43

7,2856

Bismuth

Bi

83

7,3439

Tin

Sn

50

7,3605

Ruthenium

Ru

44

7,4167

Lead

Pb

82

7,434

Manganese

Mn

25

7,4589

Rhodium

Rh

45

7,5496

Tantalum

Ta

73

7,5762

Silver

Ag

47

7,6398

Nickel

Ni

28

7,6462

Magnesium

Mg

12

7,7264

Copper

Cu

29

7,8335

Rhenium

Re

75

7,864

Tungsten

W

74

7,881

Cobalt

Co

27

7,8994

Germanium

Ge

32

7,9024

Iron

Fe

26

8,1517

Silicon

Si

14

8,298

Boron

B

5

8,3369

Palladium

Pd

46

8,417

Polonium

Po

84

8,4382

Osmium

Os

76

8,6084

Antimony

Sb

51

8,9587

Platinum

Pt

78

8,967

Iridium

Ir

77

8,9938

Cadmium

Cd

48

9,0096

Tellurium

Te

52

9,2255

Gold

Au

79

9,3

Astatine

At

85

9,3227

Beryllium

Be

4

9,3942

Zinc

Zn

30

9,7524

Selenium

Se

34

9,7886

Arsenic

As

33

10,36

Sulfur

S

16

10,4375

Mercury

Hg

80

10,4513

Iodine

I

53

10,4867

Phosphorus

P

15

10,7485

Radon

Rn

86

11,2603

Carbon

C

6

11,8138

Bromine

Br

35

12,1298

Xenon

Xe

54

12,9676

Chlorine

Cl

17

13,5984

Hydrogen

H

1

13,6181

Oxygen

O

8

13,9996

Krypton

Kr

36

14,5341

Nitrogen

N

7

15,7596

Argon

Ar

18

17,4228

Fluorine

F

9

21,5645

Neon

Ne

10

24,5874

Helium

He

2