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Periodic Table of the Elements
18
8A
1
1A
2
3
4
5
6
7

3

Li

6.941

11

Na

22.9898

19

K

39.0983

37

Rb

85.4678

55

Cs

132.9054

87

Fr

(223)

2
2A

1

13
3A

1

H

1.00794

5

4

B

Be

10.811

9.0122

12

Mg

24.3050

3
3B
21

20

Sc

Ca

40.078

44.9559

38

39

87.62

88.9058