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### AX3E

Posted: Sun Dec 02, 2018 11:56 pm
What would be the molecular shape for the general formula AX3E

### Re: AX3E

Posted: Sun Dec 02, 2018 11:58 pm
The molecule with an AX3E shape have a trigonal pyramidal shape.

### Re: AX3E

Posted: Mon Dec 03, 2018 1:32 am
The electron arrangement is tetrahedral but the molecular shape is trigonal pyramidal

### Re: AX3E

Posted: Mon Dec 03, 2018 1:50 am
It would be trigonal pyramidal since there is a lone pairs of electrons on the central atom in a tetrahedral arrangemen

### Re: AX3E

Posted: Mon Dec 03, 2018 9:19 am
a structure with an AX3E notation will be trigonal pyramidal

### Re: AX3E

Posted: Mon Dec 03, 2018 11:13 am
A molecule with AX3E would be trigonal pyramidal!

### Re: AX3E

Posted: Mon Dec 03, 2018 11:21 am
If you imagine this in 3D space, you can see that it is trigonal pyramidal tetrahedral. It is easy to confuse this with it being bent but be careful not to make that mistake.

### Re: AX3E

Posted: Mon Dec 03, 2018 12:39 pm
In order to really break this down to know that it is trigonal pyramidal, you must understand the notation used in VSEPR Model.
A is the central atom X is the number of bonded atoms E is the number of lone pairs

One example of a trigonal pyramidal shaped molecule is NH3.
N is the central atom, therefore A
There are 3 bonded atoms to N, 3 H atoms, therefore X3
There is one pair of lone pairs on top of the N, therefore E

### Re: AX3E

Posted: Thu Dec 06, 2018 10:30 am
The electron arrangement would be tetrahedral, however since one is a lone pair the shape is trigonal pyramidal.

### Re: AX3E

Posted: Thu Dec 06, 2018 10:38 am
Because of the lone pair, AX3E would be trigonal pyramidal and not tetrahedral.

### Re: AX3E

Posted: Thu Dec 06, 2018 2:27 pm
First, add together the number of bonds in the molecule (the number following X). In this case, it is 3. Then add the number of lone pairs (the number following E). In this case, it is 1. 3 + 1 = 4. Therefore, we know that the shape is tetrahedral, but since there is a lone pair, the geometry is trigonal pyramidal.

### Re: AX3E

Posted: Thu Dec 06, 2018 5:57 pm
kevinav wrote:What would be the molecular shape for the general formula AX3E

The molecule would have a trigonal pyramidal molecular shape.

### Re: AX3E

Posted: Sun Dec 09, 2018 8:26 pm
It would be trigonal pyramidal.

### Re: AX3E

Posted: Sun Dec 09, 2018 8:36 pm
First, look at the steric number of the lewis structure, which is 4 (there are 4 regions of electron density). Then look at the surrounding atoms to the central atom. The subscript following the X in the VSEPR formula indicates that there are 3 surrounding atoms. Lastly, look at the number of lone pairs attached to the central atom. The subscript to E is 1 (most times invisible), which tells us that there is only one lone pair. From here we can determine that though the shape of a structure with 4 regions of electron density would be tetrahedral, AX3E is trigonal pyramidal due to the lone pair repulsion.

### Re: AX3E

Posted: Sun Dec 09, 2018 9:29 pm
The shape is trigonal pyramidal and you base it off of the original tetrahedral shape, for once you remove a bond and add an electron pair to tetrahedral, it becomes trigonal pyramidal.

### Re: AX3E

Posted: Sun Dec 09, 2018 10:15 pm
It would be trigonal pyramidal because of the extra lone pair.

### Re: AX3E

Posted: Sun Dec 09, 2018 10:38 pm
Trigonal pyramidal because the lone pairs move the bonds closer together

### Re: AX3E

Posted: Sun Dec 09, 2018 10:39 pm
It is sp3 hybridized and because there is a lone pair, the shape is trigonal pyramidal.

### Re: AX3E

Posted: Sun Dec 09, 2018 10:45 pm
Trigonal pyrimidal. Four areas of electron density, one of which being a lone pair.