write the valency of first 20 elements
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Answer:
Heya mate !!!
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The Valency and valence electrons of the first 20 elements are -
1) Hydrogen (H)
Valency : +- 1 , Valence electrons : 1
2) Helium (He)
Valency : 0 , Valence electrons : 2
3) Lithium (Li)
Valency : +1 , Valence electrons : 1
4) Beryllium (Be)
Valency : +2 , Valence electrons : 2
5) Boron (B)
Valency : +3 , Valence electrons : 3
6) Carbon (C)
Valency : 4 , Valence electrons : 4
7) Nitrogen (N)
Valency: -3 , Valence electrons : 5
8) Oxygen (O)
Valency: -2 , Valence electrons : 6
9) Fluorine (F)
Valency: -1 , Valence electrons : 7
10) Neon (Ne)
Valency: 0 Valence electrons : 8
11) Sodium (Na)
Valency : +1 , Valence electrons : 1
12) Magnesium (Mg)
Valency : +2 , Valence electrons : 2
13) Aluminium (Al)
Valency : +3 , Valence electrons : 3
14) Silicon (Si)
Valency : 4 , Valence electrons : 4
15) Phosphorous (P)
Valency: -3 ( also 3 and 5 ),Valence electron: 5
16) Sulphur (S)
Valency: -2 , Valence electrons : 6
17) Chlorine (Cl)
Valency: -1 , Valence electrons : 7
18) Argon (Ar)
Valency: 0 , Valence electrons : 8
19) Potassium (K)
Valency : +1 , Valence electrons : 1
20) Calcium : +2 , Valence electrons : 2
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Hope helps !!