The valency of an element is the number of bonds an atom of that element can form when combining with atoms of other elements. Here are the valencies of the first 20 elements:
1. Hydrogen (H) - Valency: 1
2. Helium (He) - Valency: 0 (Helium usually does not form bonds)
3. Lithium (Li) - Valency: 1
4. Beryllium (Be) - Valency: 2
5. Boron (B) - Valency: 3
6. Carbon (C) - Valency: 4
7. Nitrogen (N) - Valency: 3 or 5
8. Oxygen (O) - Valency: 2
9. Fluorine (F) - Valency: 1
10. Neon (Ne) - Valency: 0
11. Sodium (Na) - Valency: 1
12. Magnesium (Mg) - Valency: 2
13. Aluminum (Al) - Valency: 3
14. Silicon (Si) - Valency: 4
15. Phosphorus (P) - Valency: 3 or 5
16. Sulfur (S) - Valency: 2 or 6
17. Chlorine (Cl) - Valency: 1
18. Argon (Ar) - Valency: 0
19. Potassium (K) - Valency: 1
20. Calcium (Ca) - Valency: 2
Keep in mind that the valency of an element can sometimes vary depending on the specific compound it forms.
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Answer:
The valency of an element is the number of bonds an atom of that element can form when combining with atoms of other elements. Here are the valencies of the first 20 elements:
1. Hydrogen (H) - Valency: 1
2. Helium (He) - Valency: 0 (Helium usually does not form bonds)
3. Lithium (Li) - Valency: 1
4. Beryllium (Be) - Valency: 2
5. Boron (B) - Valency: 3
6. Carbon (C) - Valency: 4
7. Nitrogen (N) - Valency: 3 or 5
8. Oxygen (O) - Valency: 2
9. Fluorine (F) - Valency: 1
10. Neon (Ne) - Valency: 0
11. Sodium (Na) - Valency: 1
12. Magnesium (Mg) - Valency: 2
13. Aluminum (Al) - Valency: 3
14. Silicon (Si) - Valency: 4
15. Phosphorus (P) - Valency: 3 or 5
16. Sulfur (S) - Valency: 2 or 6
17. Chlorine (Cl) - Valency: 1
18. Argon (Ar) - Valency: 0
19. Potassium (K) - Valency: 1
20. Calcium (Ca) - Valency: 2
Keep in mind that the valency of an element can sometimes vary depending on the specific compound it forms.
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