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Two ions A^(o+) and B^(Θ) have radii 88 ...

Two ions `A^(o+)` and `B^(Θ)` have radii `88` and `200` pm, respectively. In the close-packed crystal of compound `AB`, predict coodination number of `A^(o+)`.

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`(r_(+))/(r_(-))=0.44`
`It could be square plamer
or
Octahedral void
but for closed packed crystal
`implies` It is octahedral void
= coordination no. = 6
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