A mettalic element crystallises into a lattice containing a sequence of layers of AB AB AB ...any packing of spheres leaves out voids in the lattice . What percentage by volume of this lattice is empty space 

Asked by Farooq Ahmad Shah | 14th Jan, 2016, 05:18: PM

Expert Answer:

hcp crystal lattice consists of ABABAB layers.
The packing efficiency for hcp is 74%.
Hence, percentage by volume of the empty space is 26%.

Answered by Prachi Sawant | 14th Jan, 2016, 06:20: PM