An allotrope Two Group 4A(14) elements is Diamond, graphite, and fullerene.
The existence of an element in more than one separate form with unique properties is defined as a topic in inorganic chemistry. Both this and the property are referred to as allotropy. Allotropy is the process by which an element can exist in more than one form while having the same physical state or composition and varying atom configurations in crystalline solids. This type of element is known as an allotrope of the original element.
Carbon and silicon show allotropism.
Allotropism of carbon: diamond, graphite, fullerene
Allotropism of silicon: amorphous silicon, crystalline silicon
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