this question is of solid state.

Asked by  | 16th May, 2008, 12:53: PM

Expert Answer:

when the crystal has excess of metal called metal excess defects due to anionic vacancies. the anionicsites occupied by unpaired electrons are called Farbenzenter centers or F-Centers. excess of Li makes LiCl pink, and excess of K makes KCl voilet.

Answered by  | 20th May, 2008, 08:36: AM

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