Description
A unit cell of the cubic system has three atoms of an element A inside the cell and twelve atoms of A along the edges of the cell. There are eight atoms of B on the faces of the cell and eight atoms of B at the corners of the cell.
How many atoms of A are there in the unit cell?
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Explanation & Answer
3 inside
12 along 12 edges = 144
8 on 6 faces = 48
8 at 8 corners = 64
3 + 144 + 48 + 64 = 259
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