Engineering Chemistry

Appendix I: International Atomic Weights of Elements Based on C-12

Element

Symbol

Atomic Number

Atomic Weight

Aluminium

Al

13

26.9815

Antimony

Sb

51

121.75

Argon

Ar

184

39.948

Arsenic

As

33

74.9216

Barium

Ba

56

137.34

Beryllium

Be

4

9.0122

Bismuth

Bi

83

208.980

Boron

B

5

10.811

Bromine

Br

35

79.909

Cadmium

Cd

48

112.40

Calcium

Ca

20

40.08

Carbon

C

6

12.01115

Cerium

Ce

58

140.12

Chlorine

Cl

17

35.453

Chromium

Cr

24

51.996

Cobalt

Co

27

58.9332

Copper

Cu

29

63.54

Fluorine

F

9

18.9984

Germanium

Ge

32

72.59

Gold

Au

79

196.967

Hafnium

Hf

72

178.49

Helium

He

2

4.0026

Hydrogen

H

1

1.00797

Iodine

I

53

126.9044

Iridium

Ir

77

192.2

Iron

Fe

26

55.847

Lanthanum

La

57

138.91

Lead

Pb

82

207.19

Lithium

Li

3

6.939

Magnesium

Mg

12

24.312

Manganese

Mn

25

54.9380

Mercury

Hg

80

200.59

Molybdenum

Mo

42

95.94

Nickel

Ni

28

58.71

Niobium

Nb

41

92.906

Nitrogen

N

7

14.0067

Osmium

Os

6

190.2

Oxygen

O

8

15.9994

Palladium

Pd

46

106.09

Phosphorus

P

15

30.9738

Platinum

Pt

78

195.09

Potassium

K

19

39.102

Radium

Ra

88

226.05

Rhenium

Re

75

186.21

Rhodium

Rh

45

102.905

Ruthenium

Ru

44

101.07

Scandium

Sc

21

44.956

Selenium

Se

34

78.96

Silicon

Si

14

28.086

Silver

Ag

47

107.870

Sodium

Na

11

22.9898

Strontium

Sr

38

87.62

Sulphur

S

16

32.064

Tantalum

Ta

73

180.948

Tellurium

Te

52

127.60

Thallium

Tl

81

204.37

Thorium

Th

90

232.038

Tin

Sn

50

118.69

Titanium

Ti

22

47.90

Tungsten

W

74

183.85

Uranium

U

92

238.03

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