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यदि `Na^(+)` एवं `Cl^(-)` आयनों की त्रिज्याएँ क्रमश : 95 pm एवं 181 pm हो, तो NaCl क्रिस्टल की संरचना बताइये |

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त्रिज्या अनुपात `=r^(+)/r^(-)`
`=95/181=0.524`
चूँकि यह अनुपात 0.414 से 0.732 के मध्य है, अतः NaCl की संरचना अष्टफलकीय होगी|

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