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Kendra Sanchez
14 October, 00:23
Explain vakency with suitable example
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Rambler
14 October, 03:48
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The first 20 elements of the periodic table:
1. H - Hydrogen
2. He-Helium
3. Li-Lithium
4. Be-Beryllium
5. B-Boron
6. C-Carbon
7. N-Nitrogen
8. O-Oxygen
9. F-Fluorine
10. Ne-Neon
11. Na-Sodium
12. Mg-Magnesium
13. Al-Aluminum
14. Si-Silicon
15. P-Phosphorus
16. S-Sulfur
17. Cl-Chlorine
18. Ar-Argon
19. K-Potassium
20. Ca-Calcium
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
Explanation:
First 20 elements in the periodic table start with H and end with Ca. The quickest way to remember the number of valence electrons is to form a relationship with the number of the group the element is located in.
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