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Name the non-stoichiometric point defect...

Name the non-stoichiometric point defect responsible for the colour of alkali metals halides.

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Metal excess or anionic vacancies or F-centres, which is due to electrons entrapped in anionic vacancies.
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All real structures are three dimensional structures. They can be obtained by stacking two dimensional layers one above the other while placing the second square dose packed layer above the first we follow the same rule that was followed when one row was placed adjacent to the other. The second layer is placed over the first layer such that the spheres of the upper layer are exactly above there of the first layer. In his arrangement spheres of both the layers are perfectly aligned horizontally as well as vertically. A metallic element crystallise into a lattice having a ABC ABC pattern and packing of spheres leaves out voids in the lattice. Name the non-stoichiometric point defect responsible for colour in alkali metal halides.

What type of non-stoichiometric point defect is responsible for the pink colour of LiCl ?

Non-Stoichiometric defect

Which is responsible for the blue colour of alkali metals in liquid ammonia?

(i) What type of non stichiometirc point defect is responsible for the pink colour of LiCI? (ii)What type of stochiometric defects is shown by NaCI?

Why Frenkel defects are not found in pure alkali metal halides?