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Find the number of Na^(+) ions and Cl^(-...

Find the number of `Na^(+)` ions and `Cl^(-)` ions associated with each in a unit cell and `NaCl`.

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The correct Answer is:
4
`NaCl` has `f.c.c.` structure, 8 at the corners is shared by 8 unit cells. Each of six sodium ion at `f.c.c.` is shared by two unit cells.
`:. `No. of `Na^(+)` ions in each unit cell`=(8)/(8)+(6)/(2)=4`
`12Cl^(-)` ions at the middle of each of cell is shared by 4 cells and `Cl^(-)` ion at the centre is wholly belong to it.
`:.` No. of `Cl^(-)` ions in unit cell `=(12)/(4)+1=4`
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