An ionic compound \( \mathrm{AB} \) has fluorite type structure. If...

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An ionic compound \( \mathrm{AB} \) has fluorite type structure. If
P the radius \( \mathrm{B}^{-} \)is \( 200 \mathrm{pm} \), then the ideal radius of \( \mathrm{A}^{+} \)

W would be
(A) \( 82.8 \mathrm{pm} \)
(B) \( 146.4 \mathrm{pm} \)
(C) \( 40 \mathrm{pm} \)
(D) \( 45 \mathrm{pm} \)
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