Question

The atoms of element y form hexagonal close packing and atoms of element x occupies 2/3 portion of number of tetrahedral voids. Whats the formula of compound.

Answer 1

The number of atoms in hpc lattice ,Y=6

Tetrahedral voids,X=2 × 6

                                =12

Only 2/3rd of these will occupy so,

12 × 2/3=8

Therefore X=8,Y=6

Formula will be X₈Y₆ ie. X₄Y₃