Which of the following substances is most likely to be a gas at room temperature?

Question

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Fluorine (F) is the most electronegative element on the periodic table, which makes its molecules highly polar and thus results in strong intermolecular forces. These forces are strong enough to keep fluorine molecules together as a gas at room temperature. The other substances listed either have larger, less polar molecules (such as CBr₄ and C₆H₁₄), or have metallic bonding (such as Mn and Sr), which make them solids or liquids at room temperature.

Which of the Following Substances Is Most Likely to Be