What is atomic density on prismatic plane?

1.	What is atomic density on prismatic plane?
A.	1/a<sup>2</sup>
B.	2/ac
C.	2/a<sup>2</sup>
D.	2/‚Äö√Ñ√∂‚àö‚Ä†‚àö‚àÇ3a<sup>2</sup>
Answer» C. 2/a<sup>2</sup>

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