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If the central transition metal is bound to four ions or molecules, it is considered either square planar or tetrahedral. Generally, you don't assume that transition metals have lone pairs, which is why the shapes of coordination compounds aren't as extensive.
If there are 6 ligands at the corners of an octahedron, it is considered an octahedral complex. 4 ligands at corners of a tetrahedron is considered tetrahedral complex and 4 ligands at the corners of a square is considered square-planar. Dr. Lavelle said we will not have to differentiate between these 3 circumstances.
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