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For an ideal ionic crystal, the simplest formula is AX
P and the coordination number of cation is 6 . The value

W
of radius ratio \( \left(r_{A}^{+}: r_{x}^{-}\right) \)
(A) must be greater than 0.732 .
(B) must lie in between 0.414 and 0.732
(C) must lie in between 0.225 and 0.414
(D) must be less than 0.414 .
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