Question

symbol of first 20 element with their valency​

Answer 1

Answer:

1. H. 1
2. He. 0
3. Li. 1
4. Be. 2
5. B. 3
6. C. 4
7. N. 3
8. O. 2
9. F. 1
10. Ne. 0
11. Na. 1
12. Mg. 2
13. Al. 3
14. Si. 4
15. P. 3
16. S. 2
17. Cl. 1
18. Ar. 0
19. K. 1
20. Ca. 2

Explanation:

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