Solid StateHard
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
View Solution FreeMore Solid State Questions
The edge length of a face centered cubic cell of an ionic substance (NaCl) is 508 pm. If the radius of the cation is 110...Which of the following is/are correct ?...In the closest packing of atoms,...Which of the following shaded plane in fcc lattice contains arrangement of atoms as shown by circles :...Square packed sheets are arranged on the top of other such that a sphere in the next layer rests on the center of a squa...