A compound made up of elements ‘A’ and ‘B’ crystallizes in a cubic close-packed structure. Atoms A are present on the corners as well as face centres, whereas atoms B are present on the edge-centres as well as body centres. What is the formula of the compound?
The total contribution of A atom is calculated as: A=18 × 8 + 12 × 6 = 4A=18 × 8 + 12 × 6 = 4 The total contribution of B atom is calculated as: B=112 × 4 + 1 = 4B=112 × 4 + 1 = 4 The ratio will be = A : B = 4 : 4 or 1 : 1 The formula will be AB.
