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Question

Why are metals lustrous?

A
Light is transmitted through delocalized electrons
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B
They have a high boiling point
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C
Light is reflected through delocalized electrons
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D
Light does not travel through metals at all
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Solution

The correct option is C Light is reflected through delocalized electrons
A metal is a lattice of metal "ions" in a "sea" of delocalised electrons - mobile electrons. Photons of light do not penetrate very far into the surface of a metal and are typically reflected, or bounced off, the metallic surface, by the mobile electrons and what you get is metallic reflection, which is lustrous.

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