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Question

write the symbol and the valencies of the following
  1. sodium
  2. potassium
  3. copper
  4. silver
  5. mercury
  6. ammonium
  7. chlorine
  8. bromine
  9. iodine
  10. hydroxide
  11. acetate
  12. hydrogen carbonate
  13. hydrogen cyanide
  14. nitrate
  15. magnesium
  16. calcium
  17. zinc
  18. lead
  19. mangnese
  20. carbonate
  21. sulphate
  22. sulphite
  23. oxide
  24. aluminium
  25. iron
  26. phosphate
  27. phosphite
  28. nitrate

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Solution

1. Sodium: Na (valency 1)
2. Potassium: K (valency 1)
3. Copper: Cu (valency 1 and 2)
4. Silver: Ag (valency 1)
5. Mercury: Hg (valency 1 and 2)
6. Ammonium: NH4+ (valency 1)
7. Chlorine: Cl (valency 1)
8. Bromine: Br (valency 1)
9. Iodine: I (valency 1)
10. Hydroxide: OH- (valency 1)
11. Acetate: CH3COO- (valency 1)
12. Hydrogen carbonate: H2CO3 (valency 0)
13. Hydrogen cyanide: HCN (valency 0)
14. Nitrate: NO3- (valency 1)
15. Magnesium: Mg (valency 2)
16. Calcium: Ca (valency 2)
17. Zinc: Zn (valency 2)
18. Lead: Pb (valency 1)
19. Manganese: Mn (valency 2)
20. Carbonate: CO32- (valency 2)
21. Sulphate: SO42- (valency 2)
22. Sulphite: SO32- (valency 2)
23. Oxide: O2- (valency 2)
24. Aluminium: Al (valency 3)
25. Iron: Fe (valency 2 and 3)
26. Phosphate: PO43- (valency 3)
27. Phosphite: PO33- (valency 3)
28. Nitrate: NO3- (valency 1)

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