Question

write frist 20 elements and its valency

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Answer 1

Answer:

1. Hydrogen[H]-valency- 1
2. Helium[He]-valency-0[noble gas]
3. Lithium[Li]-valency-1
4. Beryllium[Be]-valency-2
5. Boron[B]-valency-3
6. Carbon[C]-valency-4[it is a tetravalent element]
7. Nitrogen[N]-valency-3
8. Oxygen[O]-valency-2
9. Fluorine[F]-valency-1
10. Neon[Ne]-valency-0[noble gas]
11. Sodium[Na]-valency
12. Magnesium[Mg]-valency-2
13. Aluminium[Al]-valency-3
14. Silicon[Si]-valency-4[metalloid]/semi conductor
15. Phosphorus[P]-valency-3
16. Sulphur[S]-valency-2
17. Chlorine[Cl]-valency-1
18. Argon[Ar]-valency-0[noble gas]
19. Potassium[K]-valency-1
20. Calcium[Ca]-valency-2

Answer 2

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