An ionic compound AB has fluorite type structures. if the radius of B- is 200pm then the radius of A+ would be
82.8pm
146.4pm
40 pm
45 pm
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Solution
Fluorite type structure is FCC lattice having radius of cation to anion ratio = 0.414
Since anion is 200 pm, the cation would be 0.414200 = 82.8 pm.
Answer is (a).