IA

IIA

IIIA

IVA

VA

VIA

VIIA

VIII

IB

IIB

IIIB

IVB

VB

VIB

VIIB

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

1

1 Hidrógeno H 1.01

2 Helio He 4.00

2

3 Litio Li 6.94

4 Berilio Be 9.01

5 Boro B 10.81

6 Carbono C 12.01

7 Nitrógeno N 14.01

8 Oxígeno O 16.00

9 Flúor F 19.00

10 Neón Ne 20.18

3

11 Sodio Na 23.00

12 Magnesio Mg 24.31

13 Aluminio Al 26.98

14 Silicio Si 28.09

15 Fósforo P 30.97

16 Azufre S 32.07

17 Cloro Cl 35.45

18 Argón Ar 39.95

4

19 Potasio K 39.10

20 Calcio Ca 40.08

21 Escandio Sc 44.96

22 Titanio Ti 47.89

23 Vanadio V 50.94

24 Cromo Cr 52.00

25 Manganeso Mn 54.94

26 Hierro Fe 55.85

27 Cobalto Co 58.93

28 Níquel Ni 58.69

29 Cobre Cu 63.55

30 Zinc Zn 65.39

31 Galio Ga 69.72

32 Germanio Ge 72.61

33 Arsénico As 74.92

34 Selenio Se 78.96

35 Bromo Br 79.90

36 Kriptón Kr 83.80

5

37 Rubidio Rb 85.48

38 Estroncio Sr 87.62

39 Itrio Y 88.91

40 Zirconio Zr 91.22

41 Niobio Nb 92.91

42 Molibdeno Mo 95.94

43 Tecnecio Tc [99]

44 Rutenio Ru 101.07

45 Rodio Rh 102.91

46 Paladio Pd 106.42

47 Plata Ag 107.87

48 Cadmio Cd 112.41

49 Indio In 114.82

50 Estaño Sn 118.71

51 Antimonio Sb 121.76

52 Telurio Te 127.60

53 Yodo I 126.90

54 Xenón Xe 131.29

6

55 Cesio Cs 132.91

56 Bario Ba 137.33

57-71 Lantánido *

72 Hafnio Hf 178.49

73 Tantalio Ta 180.95

74 Wolframio W 183.84

75 Renio Re 186.21

76 Osmio Os 190.23

77 Iridio Ir 192.22

78 Platino Pt 195.08

79 Oro Au 196.97

80 Mercurio Hg 200.59

81 Talio Tl 204.38

82 Plomo Pb 207.21

83 Bismuto Bi 208.98

84 Polonio Po [210]

85 Astato At [210]

86 Radón Rn [222]

7

87 Francio Fr [223]

88 Radio Ra [226]

89-103 Actínido **

104 Rutherfordio Rf [261]

105 Dubnio Db [262]

106 Seaborgio Sg [263]

107 Bohrio Bh [262]

108 Hassio Hs [277]

109 Meitnerio Mt [278]

110 Darmstadtio Ds [281]

111 Roentgenio Rg [281]

112 Copernicio Cn [285]

113 Ninonio Nh [286]

114 Flerovio Fl [289]

115 Moscovio Mc [289]

116 Livermorio Lv [293]

117 Tennesso Ts [294]

118 Oganessón Og [294]

*

57 Lantano La 138.91

58 Cerio Ce 140.12

59 Praseodimio Pr 140.91

60 Neodimio Nd 144.24

61 Prometio Pm [145]

62 Samario Sm 150.36

63 Europio Eu 151.97

64 Gadolinio Gd 157.25

65 Terbio Tb 158.93

66 Disprosio Dy 162.50

67 Holmio Ho 164.93

68 Erbio Er 167.26

69 Tulio Tm 168.93

70 Iterbio Yb 173.04

71 Lutecio Lu 174.97

**

89 Actinio Ac [227]

90 Torio Th 232.04

91 Protactinio Pa 231.04

92 Uranio U 238.03

93 Neptunio Np [237]

94 Plutonio Pu [239]

95 Americio Am [243]

96 Curio Cm [247]

97 Berkelio Bk [247]

98 Californio Cf [252]

99 Einstenio Es [252]

100 Fermio Fm [257]

101 Mendelevio Md [256]

102 Nobelio No [259]

103 Laurencio Lr [260]