1.

Select the correct statement(s) related to hexagonal close packing of identical spheres in three dimensions :

Answer»

In ONE unit cell there are 12 octahedral voids and all are COMPLETELY INSIDE the unit cell.
In one unit cell there are six octahedral voids and all are completely inside the unit cell
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
Co-ordination number of EVERY sphere is 12 in hcp lattice.

Solution :hcp=AB AB AB… pattern repeat
For calculating voids between two layers A and B
Octahedral voids=3=represented by (*).
So total octahedral voids=6= All are completely inside.


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