Write the chemical formula and name the elements present in the following compound.

Sodium chloride.

Write the chemical formula and name the elements present in the following compound;

Potassium hydroxide.

Write the chemical formula and name the elements present in the following compound;

Carbon dioxide.

Write the chemical formula and name the elements present in the following compound;

Calcium oxide.

Write the chemical formula and name the elements present in the following compound;

Sulphur dioxide.

Classify the following molecules as the molecules of element or compound.

Define the element with an example.

Define the following term with an example;

Compound.