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Why is the surface of sodium only shiny when it is freshly cut?

Why is the surface of sodium only shiny when it is freshly cut?
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Why is the surface of sodium only shiny when it is freshly cut?

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User Ssarabando
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Like most metals, sodium will oxidize when left exposed to air for an extended period of time, much like a rusted nail: it may have started shiny but over time it will rust as it is exposed to oxygen.
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User Marcel Dias
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