Square planar is actually a shape for molecular geometry with the formula AX4E2
The molecular geometry of a compound treats surrounding elements and lone pairs on the central as different.
In the formula AX4E2, A is the central atom, X are surrounding atoms and E are lone pairs.
In addition to tetrahedral, another common shape for AB4 molecules is square planar. All five atoms lie in the same plane, with the B atoms at the corners of a square and the A atom at the center of the square. Which shape in the figure below could lead to a square-planar shape upon removal of one or more atoms?
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