Which of the following choices provides the BEST explanation for the fact that bronze, an alloy of copper and tin, is a good conductor of electricity?

Copper and tin have similar atomic radii.

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Copper and tin have similar melting points.

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The structure contains a "sea" of mobile valence electrons.

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The structure consists of strong covalent bonds between the atoms.

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Solution

The correct option is D The structure contains a "sea" of mobile valence electrons.
Both tin and copper alloys having a free electron in their outermost valence shell. When potential energy is provided these electron move from one end to another and conduct the electricity.

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