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
NaCl shows Schottky defects and AgCl Frenkel defects. Their electrical conductivity is due to :...MgO exists in a rock salt type unit cell. Each Mg2+ ion will be in contact with...Following three planes (P1, P2, P3) in an fc unit cell are shown in the figure below. Consider the following statements ...Consider a Body Centered Cubic(BCC) arrangement, let de, dfd, dbd be the distances between successive atoms located alon...The number of next nearest neighbours of $\text{Cs}^+$ ion in a $\text{CsCl}$ crystal is...