For tetrahedral coordination number, the radius ratio \( \frac{\mathrm{r}_{\mathrm{c}^{+}}}{\mat...

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For tetrahedral coordination number, the radius ratio \( \frac{\mathrm{r}_{\mathrm{c}^{+}}}{\mathrm{r}_{\mathrm{a}^{-}}} \)is \( \begin{array}{ll}\text { (1) } 0.732-1.000 & \text { (2) } 0.414-0.732\end{array} \)
(1) \( 0.732-1.000 \)
(2) \( 0.414-0.732 \)
(3) \( 0.225-0.414 \)
(4) \( 0.155-0.225 \)
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