Question

using the example of calcium chloride explain how the formulae of compounds are derived ( given that the valency of calcium is 2 and that of chlorine is 1 )....answer fast please....

Answer 1

Calcium's chemical symbol is Ca. Calcium's oxidation number is +2.

Chloride's chemical symbol is Cl. Chloride's oxidation number is -1.

Ca +2 Cl -1
Ca 1 Cl 2 (Switch the two numbers)
Ca1Cl2 HOWEVER if there's only one of an element, don't write the 1 CaCl2

Answer 2

Answer:

Calcium's chemical symbol is Ca. Calcium's oxidation number is +2.

Chloride's chemical symbol is Cl. Chloride's oxidation number is -1.

Ca +2 Cl -1

Ca 1 Cl 2 (Switch the two numbers)

Ca1Cl2 HOWEVER if there's only one of an element, don't write the 1 CaCl2

I hope this helps