Which crystalline solid type is characterized by high melting point, electrical conductivity in the molten state, and brittleness in the solid phase?
Answer and explanation
Correct answer: C. Ionic solid
- Step 1: Evaluate the physical properties: high melting point arises from strong Coulombic attractions; conductivity in molten liquid is caused by mobile ions; brittleness results from cleavage when like charges align.
- Step 2: These diagnostic characteristics define ionic crystals (e.g., NaCl).
Answer
Ionic solid.
Why not the others: Molecular solids have low melting points; metallic solids are malleable, not brittle; covalent network solids do not conduct when melted.
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