An ionic compound \( A B_{2} \) has fluorite type structures. If the radius \( B^{-} \)is \( 200...
An ionic compound \( A B_{2} \) has fluorite type structures. If the radius \( B^{-} \)is \( 200 \mathrm{pm} \), then the ideal radius of \( A^{+} \)would be:
(a) \( 82.8 \mathrm{pm} \)
(b) \( 146.4 \mathrm{pm} \)
(c) \( 40 \mathrm{pm} \)
(d) \( 45 \mathrm{pm} \)
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