The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

288pm

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398pm

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618pm

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144pm

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Solution

The correct option is C 144pm
for fcc,
${2 r}^{+} + {2 r}^{-} = a 2 (110) + 2 r^{-} = 508 r^{-} = 144 p m$

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The edge length of a F.C.C. cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

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