A Visual Encyclopedia of the Periodic Table

14

Introduction

Periodic table

of elements

The periodic table is a useful way of organizing the elements.

It arranges the elements in order of their atomic number,

which is the number of protons in the nucleus of an atom,

and is unique to every element. The table also divides the

elements into rows, called “periods”, and columns, called

“groups”. Dmitri Mendeleev, the chemist who devised the

table, arranged the elements based on the similarity of

certain physical and chemical properties.

Sc

21

44.

Y

39

88.

La-Lu

57-

Ac-Lr

89-

Zr

40

91.

Hf

72

178.

Rf

104

(261)

La

57

138.

Ac

89

(227)

Ti

22

47.

Nb

41

92.

Ta

73

180.

Db

105

(262)

Ce

58

140.

Th

90

232.

V

23

50.

Mo

42

95.

W

74

183.

Sg

106

(266)

Pr

59

140.

Pa

91

231.

Cr

24

51.

Tc

43

(96)

Re

75

186.

Bh

107

(264)

Nd

60

144.

U

92

238.

Mn

25

54.

Ru

44

101.

Os

76

190.

Hs

108

(277)

Pm

61

(145)

Np

93

(237)

Fe

26

55.

Rh

45

102.

Ir

77

192.

Mt

109

(268)

Sm

62

(150.36)

Pu

94

(244)

Co

27

58.

Pd

46

106.

Pt

78

195.

Ds

110

(281)

Eu

63

151.

Am

95

(243)

Ni

28

58.

Ag

47

107.

Au

79

196.

Rg

111

(272)

Gd

64

157.

Cm

96

(247)

Cu

29

63.

Zn

30

Cd

48

Hg

80

Tb

65

Cn

112

Bk

97

112.

200.

285

158.

(247)

65.

H

1

1.

Li

3

6.

Na

11

22.

K

19

39.

Rb

37

85.

Cs

55

132.

Fr

87

(223)

Be

4

9.

Mg

12

24.

Ca

20

40.

Sr

38

87.

Ba

56

137.

Ra

88

(226)

The actinides and the

lanthanides are placed

between the alkaline earth

metals and the transition

metals, but have been

moved below to give

them more space.

014-015_Periodic_Table.indd 14 12/12/16 5:37 pm