Question

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method.

Ca (Valency 2) & O  (Valency 2)

Answer 1

Step 1: Write the symbols of the radicals.
                           Ca                     O
Step 2: Write the valency below the respective radical.
                           Ca                       O
                            2                        2
Step 3: Cross-multiply symbols of radicals with their respective valency.

Step 4: Write down the chemical formula of the compound.

CaO