Names With the symbols of the first 20 elements with their valencies with positive and negative signs
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The valency of first 20 elements is as follows :-
1. Hydrogen (H) = 1
2. Helium (He) = 0
3. Lithium (Li) = 1
4. Beryllium (Be) = 2
5. Boron (B) = 3
6. Carbon (C) = 4
7. Nitrogen (N) = 3
8. Oxygen (O) = 2
9. Fluorine (F) = 1
10. Neon (Ne) = 0
11. Sodium (Na) = 1
12. Magnesium (Mg) = 2
13. Aluminium (Al) = 3
14. Silicon (Si) = 4
15. Phosphorus (P) = 3, 5
16. Sulphur (S) = 2
17. Chlorine (Cl) = 1
18. Argon (Ar) = 0
19. Potassium (K) = 1
20. Calcium (Ca) = 2
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these are the first twenty elements with atomic number and valency..
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