Final answer:
Carbon has four allotropes: diamond, graphite, graphene, and fullerenes. Each allotrope has unique properties and structures.
Step-by-step explanation:
Carbon has four allotropes, which are different forms or arrangements of the same element. The four allotropes of carbon are diamond, graphite, graphene, and fullerenes.
Diamond is the hardest naturally occurring substance, with a three-dimensional network of carbon atoms. Graphite has layers of carbon atoms arranged in a hexagonal pattern, giving it a slippery and conducting nature. Graphene is a single layer of graphite, known for its excellent electrical conductivity and strength. Fullerenes are hollow, cage-like structures made up of carbon atoms.
Learn more about Carbon allotropes