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Because of the greater temporary dipoles, bromine molecules are stickier than chlorine molecules. Chlorine molecules will break away from each other at much lower temperatures than bromine molecules - hence bromine is a liquid and chlorine is a gas at room temperature. This is the reason that (all other things being equal) bigger molecules have higher boiling points than small ones.
More energy is needed to separate them than short chain molecules which have only weak forces of attraction for each other. QUES: Name some of the compounds in the table and state whether the compound will be a gas, liquid, or solid state at room temperature (20oC). Hint: If the boiling point is below 20oC, then the liquid has already boiled and is a gas. What is the the boiling point trend in terms of the molecular weights of the compounds? At room temperature, the lighter alkanes are gases; the midweight alkanes are liquids; and the heavier alkanes are solids, or tars.