Question

The percentage of empty space in a body centred cubic arrangement is ...............

(a) 74 (b) 68 (c) 32 (d) 26

Answer 1

Answer: (c) 32

Packing efficiency for bcc arrangement is 68% which represents total filled space in the unit cell. Hence, empty space in a body centred arrangement is 100-68=32%.

Note Here, empty space in bcc arrangement is asked therefore empty space in any crystal packing can be calculated as empty space in unit cell = 100 - packing efficiency