Which element from the following rapidly lose | vedclass

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(C) Elements of group $1$ (alkali metals) are highly reactive. They rapidly lose their metallic luster in air due to the formation of a surface layer

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$K$

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(C) Elements of group $1$ (alkali metals) are highly reactive. They rapidly lose their metallic luster in air due to the formation of a surface layer of oxide,peroxide,or superoxide by reacting with oxygen and moisture in the air. Among the given options,$K$ (potassium) is an alkali metal belonging to group $1$,while $Ba$,$Be$,and $Mg$ are alkaline earth metals (group $2$),which are relatively less reactive.

Which element from the following rapidly loses its luster in air and tarnishes?

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