Question A2 The body-centred cubic structure is common among metals. a) How many nearest neighbours has each atom in this structure? Give the nearest-neighbour distance in terms of the unit cell parameter a. b) How many second-nearest neighbours has each atom in this structure? Give the second- nearest-neighbour distance in terms of the unit cell parameter a. c) How many third-nearest neighbours has each atom in this structure? Give the third-nearest- neighbour distance in terms of the unit cell parameter a.

Question A2 The body-centred cubic structure is common among metals. a) How many nearest neighbours has each atom in this structure? Give the nearest-neighbour distance in terms of the unit cell parameter a. b) How many second-nearest neighbours has each atom in this structure? Give the second- nearest-neighbour distance in terms of the unit cell parameter a. c) How many third-nearest neighbours has each atom in this structure? Give the third-nearest- neighbour distance in terms of the unit cell parameter a.