An ionic compound AB2, has fluorite type structures. If the radius B- is 200 pm, then the ideal radius of A+ would be:

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82.8 pm

146.4 pm

40 pm

45 pm

answer is D.

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Detailed Solution

ln ideal fluorite type structure: cation is present in tetrahedral voidSo, rcra=0.225rc = 200 Ã0.225 = 45 pm

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