Shape Names
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Shape Names
What is the shape called when there are 2 lone pairs and 2 bonding pairs like H2O? Is "bent" the official shape name?
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Re: Shape Names
Yes, when 2 of 4 possible bonding regions are occupied by lone pairs, the shape is referred to as angular or bent.
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Re: Shape Names
For H20, there are four regions of electron density, but two are occupied by lone pairs of electrons. This means the other two regions are occupied by bonded electron pairs, which is what we name shaped based off of. The name for this shape is bent or angular when two of four regions of electron density are considered.
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Re: Shape Names
Yep! The shape is known as bent or angular because 2 of the 4 bonding sites are lone pairs and the lone pairs force the bonding electrons closer which decreases the bond angle.
Re: Shape Names
Angular molecules, which are also called bent or V-shaped have a non-linear shape. For example, a water molecule has two unshared lone pairs and two pairs of bonded electrons.
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Re: Shape Names
Yes, and keep in mind that the shape is also called bent when referencing a molecule with two bonds and one lone pair. For example, Sulfur dioxide would have a trigonal planar electron pair geometry and a bent molecular geometry.
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Re: Shape Names
Yes, it is called bent as there are two lone pairs of electrons and two pairs of bonded electrons.
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Re: Shape Names
When there are two lone pairs, do we always try to place them at opposite ends, like as far away from each other as possible?
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Re: Shape Names
To whoever asked, typically when you have two lone pairs, you do try to place them far away from each other as lone pairs repel each other. Hope this helps!
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Re: Shape Names
This will be bent. I'm not sure how to attach a picture on this website, but there are some really good graphics of the VSEPR table with lots of useful information. Once you memorize these tables, it becomes easier :)
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Re: Shape Names
Like the person above mentions, there are a lot of really great graphics that display all the different shapes based on lone pairs and such. Here is a link to a website with a graphic that I find quite helpful: https://courses.lumenlearning.com/bound ... -geometry/
Hope this helps!
Hope this helps!
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Re: Shape Names
The electron structure is tetrahedral, but the molecular structure is bent. Lone pairs count for the first one but not for the second.
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Re: Shape Names
Any molecule with 2 lone pairs and 2 bonding pairs is called bent. Bent is its official name
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Re: Shape Names
You're correct, the shape name is bent! It could also be angular, but bent is perfectly acceptable :)
Re: Shape Names
The shape is commonly referred to as either bent or angular. Some examples of this are H2O and NO2- (due to their lone pair(s)).
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Re: Shape Names
Reiterating what people have said before, we can say angular or bent when referring to the shape. I don't think it matters which one we use but I think the textbook refers to it as angular.
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Re: Shape Names
Wasila Sun 1K wrote:What is the shape called when there are 2 lone pairs and 2 bonding pairs like H2O? Is "bent" the official shape name?
Hi! The official name would be bent or angular. An example of this would be H2O. Here is a link to a chart that I have found very helpful with learning the names of the various shapes.
https://ds055uzetaobb.cloudfront.net/im ... 091b2c.png
Hope that helps!
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Re: Shape Names
When there are 2 lone pairs and 2 bonding pairs like H2O, it is called "bent" or "angular".
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Re: Shape Names
Hi I found this website very useful to study molecular geometry
http://intro.chem.okstate.edu/1314F00/Lecture/Chapter10/VSEPR.html
http://intro.chem.okstate.edu/1314F00/Lecture/Chapter10/VSEPR.html
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Re: Shape Names
Yes, the shape is just called bent. Bent can also result from a molecular geometry of 3 regions of electron density, and one lone pair! The bond angles will be different between these two configurations of the bent shape though.
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Re: Shape Names
Yes, bent is the official shape name, no matter whether there are two lone pairs on the central atom or one.
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Re: Shape Names
usually called bent/v-shaped. I would specifically identify it by saying the AX2E2 general formula has <109.5 degree bond angles and usually rests around 104.5 degrees
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Re: Shape Names
The shape of the water molecule or any AX2E2 molecule is bent or angular. The electron density distribution is in a tetrahedral shape however.
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Re: Shape Names
Yes, when there are 4 regions of electron density and 2 are bonding then the VSEPR shape can be referred to as bent or angular.
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Re: Shape Names
There are a variety of names that are all correct. Some people have already listed them: bent, angular, v-shape, non-linear, etc. All of these are correct and you basically just need to understand the concept behind it.
Re: Shape Names
Yes. The lone pairs are what distinguish bent from linear. I believe the repulsion from the lone pairs results in a bent molecular structure.
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Re: Shape Names
The shape would be bent or angular, and you can use either term to describe the shape since they mean the same thing.
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