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Why are halogens coloured?

7.27   Why are halogens coloured?

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All halogens are coloured due to the absorption of radiations which comes under visible region, which results in the excitation of outer electrons to higher energy level. The different quanta of radiation absorb by different halogens and they display different colours, for example is, F_2, has yellow, Cl_2, greenish yellow, Br_2, red and I_2, violet colour.

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