Molecular Geometry vs Electron Geometry

(Polar molecules, Non-polar molecules, etc.)

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MaryBanh_2K
Posts: 87
Joined: Wed Sep 18, 2019 12:21 am

Molecular Geometry vs Electron Geometry

Postby MaryBanh_2K » Fri Nov 15, 2019 12:11 am

What's the difference between the electron geometric shape and the molecular geometric shape of a molecule?

Shail Avasthi 3C
Posts: 86
Joined: Fri Aug 30, 2019 12:17 am

Re: Molecular Geometry vs Electron Geometry

Postby Shail Avasthi 3C » Fri Nov 15, 2019 1:00 am

The electron geometry is the arrangement of the regions of electron density (lone pairs + bonding regions) around the central atom. The molecular geometry is the shape of the molecule, which is only determined using the bonding regions. For example, the electron geometry of H2O is tetrahedral because the oxygen has 2 lone pairs and 2 bound hydrogens. However, the molecular geometry/shape is bent because the lone pairs are not included.

Shutong Hou_1F
Posts: 100
Joined: Sat Sep 14, 2019 12:17 am

Re: Molecular Geometry vs Electron Geometry

Postby Shutong Hou_1F » Fri Nov 15, 2019 10:59 am

The electron geometry considers all regions of electron density, regardless of bonding pairs electrons or lone pairs electrons; the molecular shape considers only bonding regions. Consequently, when the electron geometry is the same, depending on the number of lone pairs electrons, the molecular shape differs.


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