# If the value of ionic radius ratio (r_c/r_a) is 0.52 in an ionic compound, the geometrical arrangement of ions in crystal is........

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If the value of ionic radius ratio $\left(\frac{r_C}{r_a}\right)$ is 0.52 in an ionic compound, the geometrical arrangement of ions in crystal is .........

(A) tetrahedral

(B) planar triangular

(C) octahedral

(D) cubic

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