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In CaF2 crystal, 'Ca^2+'. îons are prese...

In CaF2 crystal, 'Ca^2+'. îons are present in fcc arrangement. How many 'F-' -ions are present in the unit cell?

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Number of `Ca^2+` ions in the unit ceil `=8 xx 1/8+6 xx 1/2=4`
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