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यदि प्रत्येक `Br^(-)` आयन की त्रिज्या 0.182 nm है तो कितना बड़ा धनायन इनके मध्य चतुष्फलकीय रिक्ति में प्रविष्ट हो सकता है ?

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चतुष्फलकीय रिक्ति के लिए `(r^(+))/(r^(-)) = 0.414`
`r^(+)` के अधिकतम मान के लिए
`r^(+) = 0.414 xx 0.182 = 75 xx 10^(-2)` nm
अत: `75 xx 10^(-2)` nm त्रिज्या का धनायन चतुष्फलकीय रिक्ति में प्रविष्ट हो सकता है ।

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