Question

In a CCP lattice of X and Y, X atoms are present at the corners while Y atoms are at face centers.Then the formula of the compound would be if one of the X atoms from a corner is replaced by Z atoms (also monovalent)?

• A. X7Y24Z2
• B. X7Y24Z
• C. X24Y7Zq
• D. XY24Z

Answer 1

Answer: (B)

X7Y24Z

Answer 2

X = 7x $\frac{1}{8}$ = $\frac{7}{8}$ ; Y = $\frac{1}{2}$ x 6 = 3 ; Z = $\frac{1}{8}$ ̃ X7/8 Y3 Z1/8

= X7 Y24 Z