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दो आयन `A^(+)` तथा `B^(-)` की आयनिक त्रिज्या क्रमश : 88 pm तथा 200 pm है | यौगिक AB की सघन संकुलित संरचना में, `A^(+)` की उपसहसंयोजन संख्या ज्ञात कीजिए|

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`r^(+)/r^(-)=(r(A^(+)))/(r^(B^(-)))`
`=(88 pm )/(200 pm)=0.44`
यह मान 0.414 से 0.732 की परास में है |
अतः `A^(+)` की उपसहसंयोजन संख्या = 6.

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