In face centred cubic arrangement of A and B atoms, A atoms are at the corners of the unit cell and B atoms at the face centres. One of the A atoms is missing from one corner in the unit cell. The simplest formula of the compound is

Question

In face centred cubic arrangement of A and B atoms, A atoms are at the corners of the unit cell and B atoms at the face centres. One of the A atoms is missing from one corner in the unit cell. The simplest formula of the compound is, A 7 B 3, AB 3, A 7 B 24, A 7/8 B 5

MARKS App · Accepted Answer

If one atom (A) is missing from one corner, no. of atoms A in unit cell = 7 × 1 8 = 7 8 no. of atoms B in unit cell = 6 × 1 2 = 3 A ⁡ : B ⁡ = 7 8 : 3 so simplest formula is A 7 B 24 ​

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