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निम्न क्रिस्टलो में प्रत्येक आयन की उपसहसंयोजन (समन्वय) संख्या (co-ordination number) लिखिए -
(a) NaCl
(b) CsCl
(c) `CaF_(2)`
(d) `Na_(2)O`
(e) ZnS

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(a) `NaCl` में `Na^(+) = 6 , Cl^(-) = 6`
(b) CsCl में `Cs^(+) = 8 , Cl^(-) = 8`
(c) `CaF_(2)` में `Ca^(2+) = 8 , F^(-) = 4`
(d) `Na_(2)O` में `Na^(+) = 4 , O^(2-) = 8`
(e) ZnS में `Zn^(2+) = 4 , S^(2-) = 4`

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