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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.
You might hear the term  vapor .. Vapor and gas mean the same thing. The word vapor is used to describe gases that are usually liquids at room temperature. Good examples of these types of liquids include water (H 2 O) and mercury (Hg). They get the vapor title when they are in a gaseous phase. You will probably hear the term âwater vaporâ which means water in a gas state. Compounds such as carbon dioxide (CO 2) are usually gases at room temperature. Scientists will rarely talk about carbon dioxide vapor. Gases hold huge amounts of energy and their molecules are spread out as much as possible.