30．9716 S——青夏教育精英家教网——

30．97

16 S

28．09

15 P

26．98

14 Si

24．31

13 Al

22．99

12 Mg

20．18

11 Na

19．00

10 Ne

16．00

9 F

14．01

8 O

6 C 12．01

7 N

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