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The unit cell with all sides the same length and all angles equal to 90 degrees...

The unit cell with all sides the same length and all angles equal to 90 degrees that has lattice points only at the corners is called
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The unit cell with all sides of same length and all angle equal to 90 degree and which has all lattice points at corner is the primitive Cubic unit cell

The primitive cubic system (cP) consists of one lattice point on each corner of the cube. Each atom at a lattice point is then shared equally between eight adjacent cubes, and the unit cell therefore contains in total one atom (​1⁄8 × 8).

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