Question

why anionic vacency is also called as f centre?
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Answer 1

Answer:

When the anionic sites of a crystal are occupied by unpaired electrons, the ionic sites are called F-centres. These unpaired electrons impart colour to the crystals. ... These released electrons diffuse into the crystal and occupy the vacant anionic sites, creating F-centres.

Answer 2

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$\bold{\longmapsto}$When the anionic sites of a crystal are occupied by unpaired electrons, the ionic sites are called F-centres. These unpaired electrons impart colour to the crystals. These released electrons diffuse into the crystal and occupy the vacant anionic sites, creating F-centres.

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