State the valencies of the following metallic elements -a] Potassium b] Sodium c] Calcium d] Magnesium e] Zinc f] Aluminium g] Chromium [write each symbol with the valency]

Certain metals exbibit variable valencies which include valencies 1^(+),2^(+),3^(+) & 4^(+) . State the variable valency of the following metals -a] Copper b] Silver c] Mercury d] Iron e] Tin f] Lead-[Write each symbol with the variable valency]

Write the symbols and valencies of the following radicals: (a) Magnesium ion (b) Ammonium (c) Carbonate (d) Nitrate (e) Oxide (f) Bisulphate (g) Aluminium ion

Mention two uses of the following metals and non-metals : (a) Iron (b) Aluminium (c) Gold (d) Oxygen (e) Iodine

Write the chemical formulae of the following. (a) Magnesium chloride (b) Calcium oxide (c) Copper nitrate (d) Aluminium chloride (e) Calcium carbonate.

Which of the following symbols of elements are incorrect? Give their correct symbols. Cobalt CO Carbon c c) Aluminium AL d) Helium He e) Sodium So

Predict the formula of the stable binary compounds that would be formed by the combination of the following pairs of elements. a.Lithium and oxygen b. Magnesium and nitrogen c. Aluminium and iodine d. Silicon and oxygen e. Phosphorus and fluorine f. Element 71 and fluorine

Predict the formula of the stable binary compounds that would be formed by the combination of the following pairs of elements. a.Lithium and oxygen b. Magnesium and nitrogen c. Aluminium and iodine d. Silicon and oxygen e. Phosphorus and fluorine f. Element 71 and fluorine

How many of the following clements exclusively occur in combined state? Gold, iron, zinc, aluminium, platinum, sodium, magnesium

The valency of sodium is one. Write the molecular formula for the following compounds of sodium (a) sodium oxide (b) sodium sulphate (c) sodium carbonate (d) sodium hydroxide (e) sodium nitrate

Name the chief forms of the occurrence of the following in the earth's crust : (a) Aluminium (b) Calcium ( c) Sodium (d) Lead.