What is meant by saying that metal are lustrous
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Metals are glossy/shinny because of the presence of free electrons, when the electrons move freely in the metal they result in to some light reflection because of which the metal appear shiny and we call such metal, lustrous metal.
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Metals are lustrous because of the free electrons present in them. The free electrons can move freely in the metal causing any light incident on them to get reflected back. This reflection is specular reflection rather than diffused and thus the metal surface appears shiny or lustrous
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