Question

express the relationship between atomic radius (r) and the length (a) of fcc unit cell

Answer 1

Hey!

Ur answer is :-

For FCC unit cell:
Atoms on face diagonal are in contact
Length of face diagonal = r + 2r + r = 4r
In triangle ABC,

i.e. 4r = √2 a
(i) a =
(ii) d = 2r. (Here d = distance between two nearest atoms).

#riShu:-)