Question

The ratio of close-packed atoms to tetrahedral holes in cubic close packing is ____________.

पर्याय

• 1 : 1

• 1 : 2

• 1 : 3

• 2 : 1

Answer 1

The ratio of close-packed atoms to tetrahedral holes in cubic close packing is 1 : 2.

Explanation:

In ccp, each member species has two tetrahedral voids.

In ccp, lattice atoms = `8 xx 1/8 + 6 xx 1/2` = 4

∴ Number of tetrahedral voids = 4 × 2 = 8

Thus, ratio = 4 : 8 : : 1 : 2