In hexagonal close packing of sphere in three dimensions.

In one unit cell there are 12 octahedral voids and all are completely inside the unit cell.

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In one unit cell there are 6 octahedral voids &

12 -

tetrahedral voids. and all are completely inside the unit cell.

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In one unit cell there are six octahedral void and of which three are completely inside the unit cell and other three are partially inside the unit cell.

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In one unit cell there are 12 tetrahedral voids, all are completely inside the unit cell.

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Solution

The correct option is A In one unit cell there are 6 octahedral voids & $12 -$ tetrahedral voids. and all are completely inside the unit cell.
In hexagonal close packing of sphere in three dimensions. In one unit cell there are $6 -$ octahedral voids and $12 -$ tetrahedral voids.

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is also

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and all of its octahedral voids are also occupied.

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In hexagonal close packing of sphere in three dimensions.

The correct option is A In one unit cell there are 6 octahedral voids & 12− tetrahedral voids. and all are completely inside the unit cell.In hexagonal close packing of sphere in three dimensions. In one unit cell there are 6− octahedral voids and 12− tetrahedral voids.

The correct option is A In one unit cell there are 6 octahedral voids & $12 -$ tetrahedral voids. and all are completely inside the unit cell.
In hexagonal close packing of sphere in three dimensions. In one unit cell there are $6 -$ octahedral voids and $12 -$ tetrahedral voids.