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The edge length of a face – centred cubic unit cell is 508pm. If the radius of the cation is 110pm, the radius of the anion is

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144pm

288pm

618pm

398pm

answer is A.

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Detailed Solution

$a = 2 (r + r^{-}) 508 = 2 (110 + r^{-}) r^{-} = 144 pm$

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