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एक आयनिक यौगिक `A^(+)B^(-)` में धनायन एवं ऋणायन कि त्रिज्याओं के मान क्रमश: 148 pm तथा 195 pm है | आयनिक यौगिक कि संवृत संकुलित संरचना बताइये तथा धनायन कि समन्वय संख्या कि गणना कीजिये |

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प्रस्तुत प्रश्नानुसार,
`r_(-)=148` तथा `r_(-)=195 pm`
`therefore" त्रिज्या अनुपात "=(r_(+))/(r_(-))=(148)/(195)=0.759`
चूँकि त्रिज्या अनुपात 0.732 से अधिक है अतएव यौगिक `A^(+)B^(-)` में अंतःकेंद्रित घनीय जालक () उपस्थित होगी तथा धनायन कि समन्वय संख्या का मान 8 होगा |

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