A crystal is made of particles A and B . From fcc packing and B occupies all the octahedral voids . If all the particle along the plane as shown in figure are removed , then, the formula of the crystal would be :

Options

A. AB
B. `A_(5)B_(7)`
C. `A_(7)B_(5)`
D. None of these

Explanation

No. of A atoms Left `=4-((1)/(8)xx4)-((1)/(2)xx2)=(5)/(2)`
No. of B atoms Left `=4-((1)/(4)xx2)-(1xx1)=(5)/(2)`
The simplest formula of crystal is AB