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Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 183 Marks
Question
Explain the colour of halogens.
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Answer

  • All halogens are coloured.

    HalogenFluorineChlorineBromineIodineAstatine
    pale yellowredvioletmetallic grey
  • The colour arises due to absorption of radiation in visible region and exCltation of electrons.
  • From F to I atomic size increases, hence the valence electrons are loosely bound.
  • For example, fluorine absorbs violet radiation of higher energy and transmits yellow light of lower energy while iodine absorbs yellow light of lower energy and transmits violet radiation of higher energy.

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