Lone Pairs

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

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VioletKo3F
Posts: 103
Joined: Sat Sep 07, 2019 12:18 am

Lone Pairs

Postby VioletKo3F » Wed Nov 20, 2019 12:15 pm

What does it mean to "explain why lone pairs are more likely to found in certain locations around a central atom and
how and why they affect the bond angles in a molecule, cation, or anion"?

Ada Chung 1C
Posts: 55
Joined: Sat Aug 17, 2019 12:15 am

Re: Lone Pairs

Postby Ada Chung 1C » Wed Nov 20, 2019 12:46 pm

Lone pairs can affect the bond angles because the repulsion caused by lone pairs can potentially decrease the estimated bond angle.

Hiba Alnajjar_2C
Posts: 108
Joined: Fri Aug 09, 2019 12:17 am

Re: Lone Pairs

Postby Hiba Alnajjar_2C » Wed Nov 20, 2019 1:35 pm

Due to repulsion from lone pairs, it is sometimes more favorable for a lone pair to be in the equatorial position rather than axial (or vice-versa). This is an especially prevalent concept when looking at trigonal bipyramidal and octahedral structures. It is more favorable to put a lone pair in the equatorial position if you are dealing with a trigonal bipyramidal structure since there's less repulsion. However, with octahedral structures, it would be more favorable. to put a lone pair in the axial position. As Ada pointed out, bond angles are affected by lone pairs due to their repulsion.

Bryce Barbee
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

Re: Lone Pairs

Postby Bryce Barbee » Wed Nov 20, 2019 1:37 pm

Lone pairs have a bigger cloud around them versus a bound atom. This pushes the other surrounding atoms slightly farther than a bound atom would normally making the angles smaller.

Aprice_1J
Posts: 55
Joined: Wed Sep 18, 2019 12:16 am

Re: Lone Pairs

Postby Aprice_1J » Wed Nov 20, 2019 10:28 pm

I was confused about this as well, is there a "correct" place to put the lone pair or do you just have to consider the effect it will having on shape and angles?

Cassandra_1K
Posts: 49
Joined: Wed Sep 18, 2019 12:16 am

Re: Lone Pairs

Postby Cassandra_1K » Thu Nov 21, 2019 6:45 pm

Lone pairs result in repulsion from them, therefore decreasing the bonds angles.

805097738
Posts: 180
Joined: Wed Sep 18, 2019 12:20 am

Re: Lone Pairs

Postby 805097738 » Thu Nov 21, 2019 8:31 pm

repulsion of lone pairs affects the bond angles

Anthony Hatashita 4H
Posts: 103
Joined: Wed Sep 18, 2019 12:21 am

Re: Lone Pairs

Postby Anthony Hatashita 4H » Fri Nov 22, 2019 3:06 am

Lone pairs are equatorial usually, but for something like AX4E2 they are axial so they are farthest apart.

Anika Chakrabarti 1A
Posts: 102
Joined: Sat Aug 24, 2019 12:17 am

Re: Lone Pairs

Postby Anika Chakrabarti 1A » Fri Nov 22, 2019 8:43 am

Lone pairs are more likely to be found in equatorial positions because they experience less repulsion.


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