Solid StateEasy
Question
Na and Mg crystallize in BCC and FCC type crystals respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is
Options
A.4 and 2
B.9 and 14
C.14 and 9
D.2 and 4
Solution
BCC - points are at corners and one in the centre of the unit cell
Number of atoms per unit cell = 8 ×
+ 1 = 2
FCC - points are at the corners and also centre of the six faces of each cell
Number of atoms per unit cell = 8 × + 6 × 
= 4
Number of atoms per unit cell = 8 ×
+ 1 = 2FCC - points are at the corners and also centre of the six faces of each cell
Number of atoms per unit cell = 8 ×
+ 6 × = 4Create a free account to view solution
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