Question
Question: Sodium has body centred packing. If the distance between two nearest atoms is 3.7 Å, then its lattic...
Sodium has body centred packing. If the distance between two nearest atoms is 3.7 Å, then its lattice parameter is.
A
4.8 Å
B
4.3 Å
C
3.9 Å
D
3.3 Å
Answer
4.3 Å
Explanation
Solution
For bcc packing, distance between two nearest atoms d=2r=2(43a)
⇒ Lattice constant a=32d=32×3.7=4.3A˚.