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In calcium, fluoride having the florite ...

In calcium, fluoride having the florite structures. The coordination number for calcium ion `(Ca^(2+))` and fluoride ion `(F^(-))` are

A

`4` and `2`

B

`6` and `6`

C

`8` and `4`

D

`4` and `8`

Text Solution

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The correct Answer is:
3
The `Ca^(2+)` ions are located at the face centred cubic lattice points and therefore have cubic closest packed arrangement .the `F^(-)` ions occupy all the eight tetrahedral voids.Thus the coordination number of `Ca^(2+)` ion (surrounded by eight tetrahedral voids ) is eight while the coordination number of `F^(-)` ion (occupying tetrahedral void) is four.
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Knowledge Check

  • In calcium fluoride , having the fluorite structure , the coordination numbers for calcium ion (Ca^(2+)) and fluoride ion (F^-) are

    A
    4 and 2
    B
    6 and 6
    C
    8 and 4
    D
    4 and 8

  • In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca^(2+)) and fluoride ion (F^-) are

    A
    4 and 2
    B
    6 and 6
    C
    8 and 4
    D
    4 and 8

  • In calcium fluoride, having the fluorite structure, the corrdination numbers for calcium ion (Ca^(2+)) and fluoride ion (F^(-)) are

    A
    4 and 2
    B
    6 and 6
    C
    8 and 4
    D
    4 and 8

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