Question

II. Find the Valency of:
1. Sulphide
2. Aurum
3. Nitrogen
4. Sulphate
5. Neon
6. Hydrogen
7. Carbon
8. Potassium
9. Plumbic
10.Ferrous
11. Chlorate
12. Chloride
13. Ferric
14. Cuprous
15. Cupric
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Answer 1

1) -2

2) How does the Element Gold (Aurum-Au) shoes two valencies (+1 and +3) Gold in its ground state has an electronicconfiguration of [Xe]4f14 5d10 6s1. By giving one electron it acquires a full-filled outermost d orbital. The electronic configuration of Au+1 is [Xe]4f14 5d10 .and Au+3 is formed by loosing 3 electrons.

3) 5

4) -2

5) 0

6)1

7) 4

8) 1

9) Pb4+

10) 2

11) 3

12) 1

13) 3

14) 1

15) 2

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Answer 2

1. Sulphide = -2

2. Aurum = +1 & +3

3. Nitrogen = -3 & +5

4. Sulphate = 2

5. Neon = 0

6. Hydrogen = 1

7. Carbon = ±4

8. Potassium = 1

9. Plumbic = 4

10.Ferrous = 2

11. Chlorate = 1

12. Chloride = 1

13. Ferric = 3

14. Cuprous = 1

15. Cupric = 2