Determining Bond Angle

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

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

Determining Bond Angle

Postby MaryBanh_2K » Fri Nov 15, 2019 12:07 am

If there are lone pairs around the central atom, will the bond angles always be less than the intended degrees? For example, SO2 has one lone pair and has bond angles of less than 120 degrees. On the other hand, BCl3 has no lone pairs and has bond angles of 120 degrees.

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

Re: Determining Bond Angle

Postby Shail Avasthi 3C » Fri Nov 15, 2019 1:04 am

Not always. For example, in square planar molecules, the bond angles are still 90 degrees because the axial lone pairs directly oppose each other. Another example would be linear molecules with three equatorial lone pairs: the bond angle is still 180 degrees.

Fatemah Yacoub 1F
Posts: 94
Joined: Thu Jul 11, 2019 12:16 am

Re: Determining Bond Angle

Postby Fatemah Yacoub 1F » Fri Nov 15, 2019 9:16 am

It is based on a case by case basis and what shape the lone pairs are affecting. You just have to visualize the effect of the lone pair based on the VSEPR shape you have.

NRobbins_1K
Posts: 54
Joined: Sat Aug 17, 2019 12:15 am

Re: Determining Bond Angle

Postby NRobbins_1K » Fri Nov 15, 2019 10:31 am

This website has a good chart for conceptualizing and memorizing how the bond angles change for each molecular shape

https://courses.lumenlearning.com/intro ... eometries/


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