Ionic solids, which have anionic vacancies due to metal excess defect , develop colour. Explain with an example.
Ashishmalik:
If the crystal of NaCl heated in atmosphere the sodium atom deposited on the surface of crystal and Cl ion comes out of the surface and react with Na atom and electrons get energy and and generate yellow colour
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Ionic solid generate colour due to F centers. Electrons get energy from visible part of Radiation and get excited
Example. When NaCl is heated in atmosphere
Example. When NaCl is heated in atmosphere
illustrate the example plz
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Answer:
whan an ionic solid is heated with metal vapours, metal atoms get deposited on the surface of the solid. The position of anion is occupied by electron forming
F- Centre, which absorbs light from visible region & radiates complementary colour.
For example, when NaCl is heated with Na vapour, the vacant sites of anion is occupied by electrons forming F- centre & radiate complementary colour.
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