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Question:

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 (in pm) of the anion is:

618

398

144

288

Solution:

For an ionic substance in FCC arrangement, 2 × (r+ + r-) = Edge length
2 × (110 + r-) = 508
r- = 144 pm
Hence the correct option is D.