Square planar shape

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Samantha Chung 4I
Posts: 77
Joined: Wed Oct 03, 2018 12:16 am

Square planar shape

Postby Samantha Chung 4I » Wed Nov 21, 2018 6:12 pm

For a trigonal bipyramidal general shape, we would place the lone pairs on the equatorial axis because it has least repulsion with the surrounding axial atoms, as there are two axial atoms. However, for the square planar shape, why then do we place the two lone pairs on the two opposite ends, would not that repel the surrounding four atoms in the other plane?

Brian Cook
Posts: 34
Joined: Fri Sep 28, 2018 12:15 am

Re: Square planar shape

Postby Brian Cook » Wed Nov 21, 2018 8:20 pm

Trigonal bipyramidal involves five regions of electron density whereas square planar involves six, so I used the octahedral shape as my starting point, and as you can see based off the model you can exchange the "top" and "bottom" atom bonds and make them lone pair electrons, which would result in that square planar shape.

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