Question

explain why a d6 configuration favours a tetrahedral rather than a square planar environment in a 4 coordinate complex.

Answer 1

Square planar is the geometry where the molecule looks like a square plane. Additionally, the bond angles between the ligands (the ions or molecules bounded to the central atom) are 90o. This compound has a coordination number of 4 because it has 4 ligands bound to the central atom.