Molecular v Electron Arrangement

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

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Mia Navarro 1D
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

Molecular v Electron Arrangement

Postby Mia Navarro 1D » Wed Nov 29, 2017 2:54 pm

What is the difference between the molecular and electron arrangements? Would you be able to say, for example, that the electron arrangement is tetrahedral, even if the molecular shape is trigonal pyramidal?

Meredith Steinberg 2E
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Molecular v Electron Arrangement

Postby Meredith Steinberg 2E » Wed Nov 29, 2017 2:59 pm

Yes, the electron arrangement takes into account the lone pairs (same as looking at the amount of regions of electron density). For example, NH3 has 4 regions of electron density (tetrahedral arrangement), but has a molecular shape of trigonal pyramid.

Suhail Zaveri
Posts: 24
Joined: Sat Jul 22, 2017 3:01 am

Re: Molecular v Electron Arrangement

Postby Suhail Zaveri » Wed Nov 29, 2017 3:03 pm

Hi, so for this question:

Line pairs are counted as bonds in the electron structure so if it is ax2e2 the electron structure is ax4 so tetrahedral. However, molecular is based on shape not actual electron number...hope this helps!

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