Question
From the elements $\ce{– He, Br, Pt \& O}$ ; the element which forms a polyatomic molecule is $….... \&$ which is liquid at room temperature is $……$

Answer

From the elements $\ce{– He, Br, Pt \& O ;}$ the element which forms a polyatomic molecule is $O\  \&$ which is liquid at room temperature is $Br$.

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