HUMAN BIOLOGY

Periodic Table of the Elements

1

1.008

H

11

22.99

Na

3

6.94

Li

11

22.990

Na

19

39.098

K

37

85.468

Rb

55

132.91

Cs

87

(223.02)

Fr

4

9.0122

Be

12

24.305

Mg

20

40.078

Ca

38

87.62

Sr

56

137.33

Ba

88

(226.03)

Ra

21

44.956

Sc

39

88.906

Y

71

174.97

Lu

103

(262.11)

Lr

22

47.867

Ti

40

91.224

Zr

72

178.49

Hf

104

(265.12)

Rf

23

50.942

V

41

92.906

Nb

73

180.95

Ta

105

(268.13)

Db

24

51.996

Cr

42

95.96

Mo

74

183.84

W

106

(271.13)

Sg

25

54.938

Mn

43

(97.91)

Tc

75

186.21

Re

107

(270)

Bh

26

55.845

Fe

44

101.07

Ru

76

190.23

Os

108

(277.15)

Hs

27

58.933

Co

45

102.91

Rh

77

192.22

Ir

109

(276.15)

Mt

28

58.693

Ni

46

106.42

Pd

78

195.08

Pt

110

(281.16)

Ds

29

63.546

Cu

47

107.87

Ag

79

196.97

Au

111

(280.16)

Rg

30

65.38

Zn

48

112.41

Cd

80

200.59

Hg

112

(285.17)

Cn

49

114.82

In

81

204.38

Tl

113

(284.18)

Uut

50

118.71

Sn

82

207.2

Pb

114

(289.19)

Fl

51

121.76

Sb

83

208.98

Bi

115

(288.19)

Uup

52

127.60

Te

84

(208.98)

Po

116

(293)

Lv

53

126.90

I

85

(209.99)

At

117

(294)

Uus

54

131.29

Xe

86

(222.02)

Rn

118

(294)

Uuo

18

31

69.723

Ga

32

72.63

Ge

33

74.922

As

34

78.96

Se

35

79.904

Br

36

83.798

Kr

13

26.982

Al

14

28.085

Si

15

30.974

P

16

32.06

S

17

35.45

Cl

18

39.948

Ar

5

10.81

B

6

12.011

C

7

14.007

N

8

15.999

O

9

18.998

F

10

20.180

Ne

2

4.0026

He

57

138.91

La

58

140.12

Ce

59

140.91

Pr

60

144.24

Nd

61

(144.91)

Pm

62

150.36

Sm

63

151.96

Eu

64

157.25

Gd

65

158.93

Tb

66

162.50

Dy

67

164.93

Ho

68

167.26

Er

69

168.93

Tm

70

173.05

Yb

89

(227.03)

Ac

90

232.04

Th

91

231.04

Pa

92

238.03

U

93

(237.05)

Np

94

(244.06)

Pu

95

(243.06)

Am

96

(247.07)

Cm

97

(247.07)

Bk

98

(251.08)

Cf

99

(252.08)

Es

100

(257.10)

Fm

101

(258.10)

Md

102

(259.10)

No

Atomic number

Symbol

Atomic mass

Atomic masses are based

on carbon-12. Numbers in

parentheses are mass numbers

of most stable or best known

isotopes of radioactive elements.

3456789101112

2

1

13 14 15 16 17

1 2 3 4 5 6 7

*Lanthanoids

**Actinoids

Period

Group

© Cengage Learning

Appendix II

The symbol for each element is an abbreviation of its name.

Some symbols for elements are abbreviations for their

Latin names. For instance, Pb (lead) is short for plumbum;

the word “plumbing” is related—ancient Romans made

their water pipes with lead.

Elements in each vertical column of the table behave in

similar ways. For instance, all of the elements in the far

right column of the table are inert gases; they do not inter-

act with other atoms. In nature, such elements occur only

as solitary atoms.

A-8 Appendix ii

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