Answer the following for a primitive cubic unit cell.

Question

For the type of packing answer, use letters (starting with A, then B, then C) without spaces and separated by hypens (-) to indicate the layers of solid present.

type of packing =?
type of holes =?
# atoms / 1 unit cell = 1
coordination # =6

I got the last two, but can't figure out the first 2
Any help would be appreciated

Answer 1

type of packing = A-B-C-A-B-C-A-B-C as every third level is the same in Face Centred Cubic.

type of holes =ocathedral and tetrahedral

# atoms / 1 unit cell = (4 for FCC)

coordination # = (12 for FCC)