Which option correctly identifies an allotrope of carbon?

Which option correctly identifies an allotrope of carbon?

• A. Graphite
• B. Oxygen
• C. Silicon
• D. Nitrogen

Answer: (A)

Allotropes are different structural forms of the same element. Carbon can exist in more than one form because its atoms can bond in distinct patterns. Graphite is a form of carbon where each carbon atom bonds to three neighbors in a two-dimensional hexagonal network, creating layers that can slide past one another. This layered structure gives graphite its characteristic properties, such as lubricity and electrical conduction within the layers. The other options are not carbon allotropes; they are different elements (oxygen, silicon, nitrogen), each with its own forms, but not forms of carbon.

Allotropes are different structural forms of the same element. Carbon can exist in more than one form because its atoms can bond in distinct patterns. Graphite is a form of carbon where each carbon atom bonds to three neighbors in a two-dimensional hexagonal network, creating layers that can slide past one another. This layered structure gives graphite its characteristic properties, such as lubricity and electrical conduction within the layers. The other options are not carbon allotropes; they are different elements (oxygen, silicon, nitrogen), each with its own forms, but not forms of carbon.