ELEMENTS SYMBOLS VALENCY
1.Hydrogen H 1
2.Helium He 0
3.Lithium Li 1
4.Beryllium Be 2
5.Boron B 3
6.Carbon C 4
7.Nitrogen N 3
8.Oxygen O 2
9.Fluorine F 1
10.Neon Ne 0
11.Sodium Na 1
12.Magnessium Mg 2
13.Aluminium Al 3
14.Silicon Si 4
15.Phosphorus P 3,5
16.Sulphur S 2,4,6
