Problem: 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?

FREE Expert Solution

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. 

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Problem Details

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?

Diagrams show the structure and angles of a few molecular organizations. 1- AB2 linear, 180 degrees. A central A atom is connected left and right to other atoms, forming a straight line. 2- AB3 trigonal planar. 120 degrees. A central A atom is connected left and right, both angled down, to B atoms. 3- AB4 tetrahedral 109.5 degrees. A central A atom is connected in four directions to B atoms, forming a pyramid shape. 5-  AB5 trigonal bipyramidal. 120 degrees (between horizontal atoms) and 90 degrees (between vertical atoms). A central A atom is connected horizontally to three B atoms, arranged in a trigonal planar shape, as well as above and below to two B atoms. 6- AB6 octahedral 90degrees. A central A atom is connected above and below to B atoms, as well as horizontally to four B atoms which form the corners of a diamond.


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