Symbol

Mass #

Atomic Mass Units

Atomic #

Neutrons

Au

197

196.966543

79

118

Au

198

197.968225

79

119

B

11

11.0093054

5

6

Ba

133

132.906003

56

77

Ba

137

136.905816

56

81

Be

7

7.016928

4

3

Bi

209

208.980374

83

126

Br

81

0

35

46

C

11

11.011433

6

5

C

13

13.00335483

6

7

C

14

14.00324199

6

8

Cd

111

110.904182

48

63

Cl

35

34.96885272

17

18

Co

57

56.936296

27

30

Co

59

58.933198

27

32

Co

60

59.93382

27

33

Cr

51

50.944772

24

27

Cs

133

132.905436

55

78

Cs

137

136.907085

55

82

F

18

18.000938

9

9

Fe

57

56.9353958

26

31

Fe

58

0

26

32

Ga

67

66.928205

31

36

H

3

3.016049268

1

2

He

3

3.01602931

2

1

Hg

198

197.966743

80

118

Hg

201

0

80

121

I

123

122.905605

53

70

I

125

124.904624

53

72

I

127

126.904474

53

74

I

131

130.906111

53

78

In

111

110.90511

49

62

In

113

0

49

64

Kr

82

0

36

46

Li

7

7.016003

3

4

Mo

99

98.907711

42

57

N

14

14.00307401

7

7

N

15

15.000108

7

8

N

13

13.005738

7

6

Na

22

21.994434

11

11