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Co-ordination number (CN) of barium ion ...

Co-ordination number (CN) of barium ion `(Ba^(2+))` in `BaF_(2)` is 8. What is the CN of `F^(-)` ion ?

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The correct Answer is:
4
C.N. of `Ba^(2+)` ions suggests that if is surrounded by eight `F^(-)` ions. `(8xx(-1)=-8)`. In order to balance eight negative charges, we need four `Ba^(2+)` ions. `therefore` C.N. of `F^(-)` ions = 4
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