Does it have anything to with iodines polarizability? Is there a way to explain this using sigma bonding or an MO diagram?

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    $\begingroup$ Well, they're completely different compounds. Is there any reason you'd expect them to not have different colours? $\endgroup$ – Nicolau Saker Neto Feb 23 '16 at 9:52
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    $\begingroup$ Why is $\ce{KI}$ white? As @NicolauSakerNeto said there is no reason why they should have the same colour, simply because they contain a common element. $\endgroup$ – bon Feb 23 '16 at 14:11
  • $\begingroup$ I understand that. I was hoping someone could explain in terms of MO theory or bonding symmetry. For example, is the I-I bond much lower energy than the Sn-I bond so it would absorb more lower frequencies of light? $\endgroup$ – Nova Feb 23 '16 at 20:02