Question

How to find out valency of the elements having atomic no. 1 to 20?

Answer 1

Hello
1. H. Hydrogen. 1, 0, -1
2. He. Helium 0
3. Li. Lithium. 1,-1
4. Be. Beryllium. 2
5. B. Boron. 3, 2, 1
6. C. Carbon. 4, 3, 2, 1, -1, -2, -4
7. N. Nitrogen. 5, 4, 3, 2, 1, 0, -1, -2, 8. O. Oxygen. 2, 1, 0, -1, -2
9. F. Fluorine. 0, -1
10. Ne. Neon. 0
11. Na. Sodium. 1, -1
12. Mg. Magnesium. 2
13. Al. Aluminum. 3, 1
14. Si. Silicon. 4, 3, 2, 1, -1, -2, -4 15. P. Phosphorus. 5, 4, 3, 2, 1, 0, -1, 16. S. Sulfur. 6, 5, 4, 3, 2, 1, 0,
17. Cl. Chlorine. 6, 5, 4, 3, 2, 1, 0, -1, 18. Ar. Argon. 0
19. K. Potassium. 1, -1
20. Ca. Calcium. 2

Hope this would help you
@Rohit