Question

Valency and valence electrons of first 20 elements​

Answer 1

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 !!

Answer 2

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• H - Hydrogen
• He - Helium
• Li - Lithium
• Be - Beryllium
• B - Boron
• C - Carbon
• N - Nitrogen
• O - Oxygen
• F - Fluorine
• Ne - Neon
• Na - Sodium
• Mg- Magnesium
• Ai - Aluminum
• Si - Silicon
• P - Phosphorus
• S - Sulfur
• Cl - Chlorine
• Ar - Argon
• K - Potassium
• Ca - Calcium