Question

Question #988ef

Answer 1

If you count all your electrons, you will find that there are seven electron groups.

This seventh electron pair actually distorts the geometry so that its geometry LOOKS more like two `"NH"_3` molecules (so-called "`C_(3v)`" symmetry) with their `"N"` atoms aligned towards each other, rather than an octahedral shape (so-called "`O_h`" symmetry).

Hence, it is more like this:

(notice the similarity to this.)

The distortion mostly happens on one plane bisecting the two previously-octahedral faces, apparently, in order for it to have the distorted symmetry previously mentioned (`C_(3v)`).