Kaplan Nursing Entrance Practice Exam

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Which of the following is NOT an allotrope of carbon?

Diamonds
Graphite
Flourine
Buckminsterfullerene

The correct answer is: Flourine

The correct answer is Flourine because it is not an allotrope of carbon. Allotropes are different forms of the same element that have distinct physical and chemical properties due to differences in the arrangement of atoms. Diamonds, graphite, and Buckminsterfullerene are all recognized allotropes of carbon. In diamonds, carbon atoms are arranged in a tetrahedral lattice structure, giving them a hard and transparent quality. Graphite has a layered structure where carbon atoms are arranged in sheets, which allows them to slide over each other, making graphite slippery and an excellent lubricant. Buckminsterfullerene, often referred to as "buckyballs," consists of carbon atoms arranged in a spherical shape, resembling a soccer ball. Flourine, on the other hand, is a diatomic molecule (F2) and an element from the halogen group, which does not share the same elemental composition or allotropes as carbon.