Question

7. Write the valencies of some common elements and groups
(i) Hydrogen (ii) Oxygen (iii) Aluminium (iv) Carbon (v) Nitrogen (Vi) Sulphur (vii) Iron (viii) Phosphate
(ix) Chlorine (x) Iodine

Answer 1

Hydrogen can be H+1 or H-1.
Oxygen is 2-
Aluminium is 3+
Carbon is 4-
Nitrogen is 3-
Sulphur is 2-
Iron can be 2+ or 3+.
Phosphate is (PO4)3-.
Chlorine is 1-.
Iodine is 1-.

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