Intermediate Topic 157 of 1102 Bonding & Molecular Structure
Octahedral Geometry
Six groups at 90 degrees, as in SF6.
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In-depth explanation of Octahedral Geometry
Octahedral geometry occurs when a central atom has six electron domains, which point along the positive and negative directions of three Cartesian axes at 90-degree angles. Each domain is a bond or a lone pair, and all six bonds are equivalent if no lone pairs are present. Octahedral geometry is extremely common in transition metal coordination complexes, where six ligands bind the metal ion. The traditional hybridization label is sp3d2, although modern bonding descriptions do not require d orbitals. A molecule with six identical substituents is nonpolar.
Going deeper: Octahedral Geometry
Key ideas: AX6 (SF6, PF6-, Mo(CO)6, and coordination complexes) has all angles 90 or 180 degrees. Replacing one ligand gives square pyramidal, replacing two gives square planar if opposite, or distorted if adjacent. In complexes, the d orbitals split into t2g and eg. Isomers arise for MA4B2 (cis and trans) and MA3B3 (fac and mer).
Common mistakes and connections: Students think octahedral means eight faces to count atoms: it has six vertices and eight faces. Another error is saying all bond angles are 90 degrees, ignoring the 180 degree angle between opposite groups. Links to crystal field theory, isomerism, sp3d2 labels and square planar derivatives.
Visualization of Octahedral Geometry
Six fluorines surround sulfur along the three axes, with every F-S-F angle 90 or 180 degrees, giving a highly symmetric nonpolar molecule. The interactive lesson shows this as a live animation or chart.
Worked example and use case
In SF6 adjacent F-S-F angles are 90 degrees and the molecule is nonpolar.
Frequently asked questions about Octahedral Geometry
What is Octahedral Geometry?
Six groups at 90 degrees, as in SF6.
Is Octahedral Geometry a beginner, intermediate or advanced topic?
Octahedral Geometry is a intermediate topic in Bonding & Molecular Structure. It builds on the vocabulary of beginner topics in this area.
What should I learn before Octahedral Geometry?
Study these earlier topics in Bonding & Molecular Structure first: Trigonal Planar Geometry, Tetrahedral Geometry, Trigonal Bipyramidal Geometry.
What comes after Octahedral Geometry?
The next topics in Bonding & Molecular Structure are Bent Geometry and Trigonal Pyramidal Geometry.
Can I practise Octahedral Geometry with quizzes?
Yes. The interactive lesson includes a self-check question on Octahedral Geometry, and the Bonding & Molecular Structure quiz draws on every topic in this area.
Where Octahedral Geometry fits in Bonding & Molecular Structure
Octahedral Geometry is topic 42 of 104 in Bonding & Molecular Structure.