An element belonging to group 14 of the periodic table has two common allotropes A and B. A is very hard and a non conductor of electricity while B is soft to touch and good conductor of electricity . Identify the element . Name each of these allotropes.

Explanation

The element of group 14 having two common allotropes is carbon . These two allotropes (A and B) of carbon element are diamond and graphite. This is confirmed by the fact that diamond is very hard and a non conductor of electricity whereas graphite is soft to touch and good conductor of electricity