« on: 30/06/2008 23:03:11 »
Not all chemicals have interactions that fall in the optical frequency bands many of them have interations that fall inot the infra red and ultra vioplet frequencies which offer far more bandwidth than the optical bands. What are called "transition elements" on which the only changes between their neihbours are more likely to have changes at optical frequencies so many compounds and salts involving transition elements are strongly coloured. Transition elements also tend to have several diffferent ionisation states available to them and so exhibit quite a complex chemistry with the same element being responsible for several different colours of ions in solution.
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