How alkali metals react with oxygen
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The alkali metals tend to form ionic solids in which the alkali metal has an oxidation number of +1. ... All the alkali metals react directly with oxygen; lithium and sodium form monoxides, Li2O and Na2O, and the heavier alkali metals form superoxides, MO2.
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When the alkali metals are cut, they initially appear shiny grey but quickly become dull and white as they react with oxygen in the air. This is known as tarnishing.
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