(B) Among the alkali metals $(Group \ 1)$,only $Li$ reacts directly with nitrogen to form lithium nitride $(Li_3N)$.Other alkali metals like $K$,$Na$,

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(B) Among the alkali metals $(Group \ 1)$,only $Li$ reacts directly with nitrogen to form lithium nitride $(Li_3N)$.Other alkali metals like $K$,$Na$,and $Rb$ do not react with nitrogen under normal conditions.Therefore,$K$ is the metal that does not react with nitrogen.