F-centres are formed in NaCl crystal if it is | vedclass

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(C) When $NaCl$ crystals are heated in an atmosphere of $Na$ vapour,the $Na$ atoms deposit on the surface of the crystal.$Cl^-$ ions diffuse to the su

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Metal excess defect

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(C) When $NaCl$ crystals are heated in an atmosphere of $Na$ vapour,the $Na$ atoms deposit on the surface of the crystal.$Cl^-$ ions diffuse to the surface and combine with $Na$ atoms to form $NaCl$,which releases electrons into the crystal lattice.These electrons occupy the vacant anionic sites,known as $F$-centres ($F$ stands for the German word 'Farbe',meaning colour).This phenomenon is a type of metal excess defect caused by anionic vacancies.

$F$-centres are formed in $NaCl$ crystal if it is heated with $Na$ vapour. The above is due to

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