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In the compound AX, the radius of `A^+` ion is 95 pm and that of `X^-` ion is 181 pm. Predict the crystal structure of AX and write the coordination number of of each of the ions.

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Radius ratio, `r_+ // r_-` =95/181=0.525 which lies in the range 0.414-0.732. Hence, the structure is octahedral and coordination number is 6.

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