[sublime4510]

Answer the following for a primitive cubic unit cell.
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

[AWK]

types
http://www.wwnorton.com/college/chemistry/gilbert/concepts/chapter10/ch10_1.htm
holes
http://www.chm.davidson.edu/chemistryApplets/Crystals/IonicSolids/holes.html