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

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Correct option is C)
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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