Question

valency of electrons of first 20 elements​

Answer 1

Answer:

Element Symbol Atomic Number Valency

Hydrogen H 1 1

Helium He 2 0

Lithium Li 3 1

Beryllium Be 4 2

Boron B 5 3

Carbon C 6 4

Nitrogen N 7 3

Oxygen O 8 2

Fluorine F 9 1

Neon Ne 10 0

Sodium Na 11 1

Magnesium Mg 12 2

Aluminum Al 13 3

Silicon Si 14 4

Phosphorus P 15 3

Sulphur S 16 2

Chlorine Cl 17 1

Argon Ar 18 0

Potassium K 19 1

Calcium Ca 20 2

Answer 2

Answer:

Valency of first 20 elements are:

1. Hydrogen -1
2. Helium - 2
3. Lithium-1
4. Beryllium2
5. Boron-3
6. Carbon-4
7. Nitrogen-3
8. Oxygen-2
9. Flourine-1
10. Neon-0
11. Sodium-1
12. Magnesium-2
13. Aluminum-3
14. Silicon-4
15. Phosphorous-3
16. Sulphur-2
17. Chlorine.-1
18. Argon-0
19. Potassium-1
20. Calcium-2

Explanation:

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