Question

Total number of Na+ at edge centers of the unit cell
of NaCl if Cl- has fcc arrangement is
(1) 4
(2) 3
(3) 2
(4) 1
...​

Answer 1

Answer:

(2)

Explanation:

there are 12 edge centers and contribution at each edge center is 1/4.

so 12×1/4= 3 Na+ will be present