why iodine is a solid, bromine is a liquid and chlorine is gas at room temperature?

It has to do with intermolecular forces. I has the strongest, so it doesn't boil until 364degF; Br is next & boils at 137.8degF. Cl boils at -29.27degF.
Updated on Thursday, February 02 2012 at 12:58AM EST
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