Lone pairs

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

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Maria Roman 1A
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

Lone pairs

Postby Maria Roman 1A » Wed May 30, 2018 11:28 pm

Based on the shape of a molecule, how can you determine if the central atom must have lone pairs?
Do the angles between the molecules affect this?

RubyLake1F
Posts: 41
Joined: Fri Apr 06, 2018 11:03 am

Re: Lone pairs

Postby RubyLake1F » Thu May 31, 2018 12:04 am

For this type of problem you should look at the given number of bonding pairs (based on the ball and stick model of the molecule that is given), and then see if that given number of regions of electron density would explain the angles that you can see in the molecule. So for example, if you see that there are two atoms bonded to one central atom and they are bent at an angle, this would not happen unless there were some other force (a lone pair or two) pushing the bonded pairs towards each other. If you see a molecule that is linear with one central atom and two bonded atoms, this could either be explained by the fact that there are no lone pairs, or that there are three (which also creates a linear shape).
Hope this helps!


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