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Write the coordination numbers of cation...

Write the coordination numbers of cations and anions in the following ionic compounds :
(a) Zinc blende (b) Fluortie

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Zinc blende=ZnS, `Zn^(2+)=4 , S^(2-)`=4
Fluorite=`CaF_2, Ce^(2+)`=8 , `F^-` = 4
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