State two factors that are involved in explaining the radius of an element in Group $14.$

The atomic radius of tin is greater than that of lead. but the ionisation energy of tin is buver than that of lead. WHY?

What is an allotrope? What distinguishes allotropes of carton? State each of the differences.

Why does carbon show a much greater tendency for catenstion in comparison to filicon?

$5$ State three methods of $CO$ production.