How does bonding affect the hardness of a crystal?
A) Covalently bonded crystals are harder than ionically bonded crystals.
B) Ionically bonded crystals are harder than covalently bonded crystals.
C) Some ionically bonded crystals are harder than covalently bonded crystals, depending on the charges of ions involved.
D) Some covalently bonded crystals are harder than ionically bonded crystals.
Answer: D
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