What fraction of the holes of this type does it occupy? — Solid State Chemistry Question

💡 Solution & Explanation

The FCC-like lattice contains 4 octahedral voids per unit cell (1 at body centre + 3 from edge centres). The single titanium ion per unit cell occupies only the body-centred void, which is 1 out of 4 voids, yielding a fraction of 0.25. Therefore, correct answer is A.