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The colour of the $$X_2$$ molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to
the physical state of $$X_2$$ at room temperature changes from gas to solid down the group
decrease in ionization energy down the group
decrease in $$\pi^* - \sigma^*$$ gap down the group
decrease in HOMO-LUMO gap down the group
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