Diamond is a/an:

Correct answer: Allotropic form of Carbon. Diamond is an allotrope of carbon.

Background: Graphite and fullerene are other allotropes of carbon.

• Isotope: Isotopes are atoms of the same element with different masses.
• Compound: A compound has different elements chemically joined.
• Mixture: A mixture has substances that are not chemically joined.

Did you know? Diamond is the hardest natural substance.

Memory trick: Diamond, graphite = carbon allotropes.