Molecular Shape vs. Electron Geometry

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

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705170809
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Molecular Shape vs. Electron Geometry

Postby 705170809 » Sun Nov 18, 2018 8:15 pm

What's the difference between electron geometry and molecular shape?

yaosamantha4F
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Joined: Fri Sep 28, 2018 12:29 am

Re: Molecular Shape vs. Electron Geometry

Postby yaosamantha4F » Sun Nov 18, 2018 8:36 pm

Electron geometry refers to how electron groups are arranged, while molecular shape how all the atoms in a molecule are arranged. Lone and bonding electron pairs are considered in electron geometry, while molecular shape only considers bonding electron pairs.

For example, using electron geometry, a trigonal planar shaped molecule has three bonds. The molecular shape of this molecule is also trigonal if there are atoms bonded at all three locations, but if atoms are only bonded at one or two of the three pairs of electrons and a lone pair is present, the molecular shape bent instead.

ryanhon2H
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Joined: Fri Sep 28, 2018 12:28 am

Re: Molecular Shape vs. Electron Geometry

Postby ryanhon2H » Sun Nov 18, 2018 8:38 pm

Electron geometry is the geometry of all the electron groups, including lone pairs and bonds. Molecular shape is the actual position of the atoms, not including lone pairs. For example, NH3 electron geometry is tetrahedral (due to 3 bonds and 1 lone pair), but the molecular geometry is trigonal pyramidal, due to its 3 bonds (so just the 3 bonds/atoms).

amogha_koka3I
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Re: Molecular Shape vs. Electron Geometry

Postby amogha_koka3I » Sun Nov 18, 2018 9:05 pm

So is this an easy way to look at it: electron geometry/arrangement takes into account lone pairs of the central atom whereas molecular shape simply considers the shared bonds?

Chloe Likwong 2K
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Re: Molecular Shape vs. Electron Geometry

Postby Chloe Likwong 2K » Sun Nov 18, 2018 9:09 pm

amogha_koka3I wrote:So is this an easy way to look at it: electron geometry/arrangement takes into account lone pairs of the central atom whereas molecular shape simply considers the shared bonds?


Yeah, that is the difference between the two.


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