Taula Periòdica dels Elements Químics

Pesos atòmics i valències

Períod

Grups

1 IA 1A

18 VIIIA 8A

1

1   +1 H 1.008

2 IIA 2A

13 IIIA 3A

14 IVA 4A

15 VA 5A

16 VIA 6A

17 VIIA 7A

2 He 4.003

2

3 +1 Li 6.941

4 +2 Be 9.012

5 3 B 10.81

6 2, +4 C 12.01

7 +3,5,4,2 N 14.01

8 -2 O 16.00

9 -1 F 19.00

10 Ne 20.18

3

11 +1 Na 22.99

12  +2 Mg 24.31

3 IIIB 3B

4 IVB 4B

5 VB 5B

6 VIB 6B

7 VIIB 7B

8

9

10

11 IB 1B

12 IIB 2B

13 3 Al 26.98

14 4 Si 28.09

15 +3, 5, 4 P 30.97

16 +2,4,6 S 32.07

17 +1, 3, 5 7 Cl 35.45

18 Ar 39.95

------- VIII ------- ------- 8 -------

4

19 +1 K 39.10

20 +2 Ca 40.08

21 3 Sc 44.96

22 4, 3 Ti 47.88

23 5,4,3,2 V 50.94

24  6,3,2 Cr 52.00

25 7,6,4,2,3 Mn 54.94

26 2, 3 Fe 55.85

27 2, 3 Co 58.47

28 2, 3 Ni 58.69

29 2, 1 Cu 63.55

30 2 Zn 65.39

31 3 Ga 69.72

32 4 Ge 72.59

33 +3,5 As 74.92

34 -2,6 Se 78.96

35 +1, 5 Br 79.90

36 Kr 83.80

5

37 +1 Rb 85.47

38 +2 Sr 87.62

39 3 Y 88.91

40 4 Zr 91.22

41 5, 3 Nb 92.91

42 6,5,4,3,2 Mo 95.94

43 7 Tc (98)

44 2,3,4,6,8 Ru 101.1

45 2,3,4 Rh 102.9

46 2, 4 Pd 106.4

47 1 Ag 107.9

48 2 Cd 112.4

49 3 In 114.8

50 4, 2 Sn 118.7

51 +3,5 Sb 121.8

52 -2,4,6 Te 127.6

53 +1, 5, 7 I 126.9

54 Xe 131.3

6

55 +1 Cs 132.9

56 +2 Ba 137.3

57 3 La* 138.9

72 4 Hf 178.5

73 5 Ta 180.9

74 6,5,4,3,2 W 183.9

75 7 Re 186.2

76 2,3,4,6,8 Os 190.2

77 2,3,4,6 Ir 190.2

78 2, 4 Pt 195.1

79 3, 1 Au 197.0

80 2,1 Hg 200.5

81 3,1 Tl 204.4

82 4, 2 Pb 207.2

83 3, 5 Bi 209.0

84 2, 4 Po (210)

85 +1, 3, 5  7 At (210)

86 Rn (222)

7

87 +1 Fr (223)

88 +2 Ra (226)

89 3 Ac~ (227)

104 Rf (257)

105 Db (260)

106 Sg (263)

107 Bh (262)

108 Hs (265)

109 Mt (266)

110 --- ()

111 --- ()

112 --- ()

114 --- ()

116 --- ()

118 --- ()

Lanthanids *

58 3, 4 Ce 140.1

59 3, 4 Pr 140.9

60 3 Nd 144.2

61 3 Pm (147)

62 3,2 Sm 150.4

63 3, 2 Eu 152.0

64 3 Gd 157.3

65 3, 4 Tb 158.9

66 3 Dy 162.5

67 3 Ho 164.9

68 3 Er 167.3

69 3, 2 Tm 168.9

70 3, 2 Yb 173.0

71 3 Lu 175.0

Actinids ~

90 4 Th 232.0

91 5, 4 Pa (231)

92 6,5,4,3 U (238)

93 6,5,4,3 Np (237)

94 6,5,4,3 Pu (242)

95 6,5,4,3 Am (243)

96 3 Cm (247)

97 4, 3 Bk (247)

98 3 Cf (249)

99 Es (254)

100 Fm (253)

101 Md (256)

102 No (254)

103  Lr (257)