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Tough Like A Diamond

The hardest substance known is diamond. Which best describes the structure of diamond?

A. A 3D network lattice of covalently bonded carbon atoms.

B. A 3D network lattice of covalently bonded carbon atoms.

C. A 3D network lattice of carbon ions held together by ionic bonds.

D. A 3D network lattice of carbon ions in a sea of mobile valence electrons held together by metallic bonds.

E. A 3D network lattice of carbon atoms held together by hydrogen bonding and dispersion forces.

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