linear vs bent question

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Vana Mirzakhani 3I
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Joined: Fri Sep 28, 2018 12:24 am

linear vs bent question

Postby Vana Mirzakhani 3I » Sun Nov 25, 2018 8:36 pm

How come for trigonal planar geometry and for tetrahedral geometry if the number of bonded electrons (coordination number) is 2, the molecular geometry is bent but for trigonal bipyramidal when the number of bonded electrons is 2, the molecular geometry is linear - not bent? Thank you in advance!

kateminden
Posts: 63
Joined: Fri Sep 28, 2018 12:24 am

Re: linear vs bent question

Postby kateminden » Sun Nov 25, 2018 10:23 pm

Hi! Whether a molecule is bent or linear depends on if it has a lone pair. Lone pairs push the other bonds away, creating a bent or angular shape. For example, CO2 is a linear molecule because it does not have a lone pair, but H2O is a bent molecule because of the lone pairs on the oxygen atom.

Celeste 1I
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Joined: Fri Sep 28, 2018 12:18 am

Re: linear vs bent question

Postby Celeste 1I » Sun Nov 25, 2018 10:24 pm

I think the bent shape comes from a third region of electron density being a lone pair. So the lone pair pushes the other two atoms down.

Andreana Vetus 1A
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Joined: Fri Sep 28, 2018 12:17 am

Re: linear vs bent question

Postby Andreana Vetus 1A » Sun Nov 25, 2018 10:26 pm

The bent shape is a result of the lone pair. In a trigonal planar shape where there is one lone pair present, the molecular shape is bent because the lone pair repels or pushes away the two surrounding atoms.

deepto_mizan1H
Posts: 65
Joined: Fri Sep 28, 2018 12:16 am

Re: linear vs bent question

Postby deepto_mizan1H » Mon Nov 26, 2018 2:34 pm

In addition to the great explanations above, the lone pairs become very important in differentiating certain compound models due to their repulsive forces, which also directly changes the bond angles. They are tricky but important for understanding the compounds better.

Brian Hom 2F
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Joined: Fri Sep 28, 2018 12:24 am

Re: linear vs bent question

Postby Brian Hom 2F » Mon Nov 26, 2018 2:43 pm

When there are five areas of electron density and only two bondings pairs, the molecular shape is linear since the unbonded electrons are in the equatorial plane and they cancel each other's repulsion, leaving the bond angle to be 180. For the tetrahedral and trigonal planar geometry, when there are two bonds, the shapes are bent because the unpaired electrons repel.

Hadji Yono-Cruz 2L
Posts: 64
Joined: Fri Sep 28, 2018 12:26 am

Re: linear vs bent question

Postby Hadji Yono-Cruz 2L » Wed Nov 28, 2018 4:02 pm

The bent shape comes from the lone electron pair because that region counts as an area of electron density. That lone pair causes a repulsion for the other electrons which push the other bond angles closer together.

Selina Bellin 2B
Posts: 62
Joined: Fri Sep 28, 2018 12:25 am

Re: linear vs bent question

Postby Selina Bellin 2B » Wed Nov 28, 2018 4:03 pm

bent aka angular happens when a linear looking molecule has an area of electron density surrounding the central atom that consists of a lone pair


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