Chem: primitive cubic packing

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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

  • Chem: primitive cubic packing -

    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)

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