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Identifying the effective number of atoms in the given unit cell. (INTERMEDIATE)

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Problem

In a primitive unit cell, a plane is passed along one of the faces as shown below.
If all the atoms along the plane are removed, calculate the effective number of atoms per unit cell.
Note: Report your answer in fractions.
  • Your answer should be
  • a proper fraction, like 1/2 or 6/10
  • an improper fraction, like 10/7 or 14/8