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2015-12-13T20:05:10+05:30

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The first 20 elements in the periodic table start with H and end with Ca. As acc. to the periodic table the valencies are 
1 Hydrogen 1 
2 Helium 0 
3 Lithium 1 
4 Beryllium 2 
5 Boron 3 
6 Carbon 2, 4 
7 Nitrogen 3, 5 
8 Oxygen 2 
9 Fluorine 1 
10 Neon 0 
11 Sodium 1 
12 Magnesium 2 
13 Aluminium 3 
14 Silicon 4 
15 Phosphorus 3, 5 
16 Sulphur 2, 4, 6 
17 Chlorine 1, 3, 5, 7 
18 Argon 0 
19 Potassium 1 
20 Calcium 2

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lol.. mu mouth is shut but my hands and mind will not stop to say like this. it is true
i'm damm sure
Comment has been deleted
R u mad??
Chutkuu .. :P