Why do the alkali metals have to be stored under oil?

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Answer 1 · 2017-01-05T04:14:22

Because they are highly sensitive to air-borne moisture and air.

The oil acts as a barrier, or protective layer to air-borne moisture. When you cut a surface of the metal you see a shiny layer that tarnishes readily.

#Na(s) + H_2O(g) rarr NaOH(s) + 1/2H_2(g)#