Diamond and graphite are both made only of carbon atoms but have very different properties. They are
Correct answer: C. allotropes
- A. isomers
- B. isotopes
- C. allotropes
- D. isomorphs
Explanation
Allotropes are different structural forms of the same element in the same physical state, and here diamond is a rigid three dimensional network while graphite is made of layers with delocalised electrons between them. That is why diamond is the hardest natural substance and an insulator, while graphite is soft, slippery and conducts electricity. Isotopes differ in neutron number, not in bonding.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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