Question

effect of boiling point in halogen group

Answer 1

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The heavier halogens have more electrons in their valence shells,making more opportunities for the temporary imbalances that create vander Waals forces.With more opportunities to create instantaneous dipoles ,the dipoles occur more frequently making the vander Waals forces stronger between the molecules of heavier halogen. It takes more heat to overcome these stronger forces,meaning that boiling points are higher for heavier halogen. The boiling point of the halogen as a group are generally low.
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