## AX3E

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

kevinav
Posts: 32
Joined: Fri Sep 28, 2018 12:16 am

### AX3E

What would be the molecular shape for the general formula AX3E

Zenita Leang 2K
Posts: 67
Joined: Fri Sep 28, 2018 12:28 am

### Re: AX3E

The molecule with an AX3E shape have a trigonal pyramidal shape.

Sang Hyoun Hong 3G
Posts: 31
Joined: Fri Sep 28, 2018 12:27 am

### Re: AX3E

The electron arrangement is tetrahedral but the molecular shape is trigonal pyramidal

Kenan Kherallah 2C
Posts: 78
Joined: Fri Sep 28, 2018 12:17 am

### Re: AX3E

It would be trigonal pyramidal since there is a lone pairs of electrons on the central atom in a tetrahedral arrangemen

504999383
Posts: 11
Joined: Fri Sep 28, 2018 12:25 am

### Re: AX3E

a structure with an AX3E notation will be trigonal pyramidal

Kaylee Kang 1G
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

### Re: AX3E

A molecule with AX3E would be trigonal pyramidal!

Veronica Soliman 4H
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

### Re: AX3E

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.

Posts: 33
Joined: Fri Sep 28, 2018 12:18 am

### Re: AX3E

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

Ricardo Martin 1J
Posts: 63
Joined: Fri Sep 28, 2018 12:15 am

### Re: AX3E

The electron arrangement would be tetrahedral, however since one is a lone pair the shape is trigonal pyramidal.

Julia Jones 1G
Posts: 29
Joined: Fri Sep 28, 2018 12:16 am

### Re: AX3E

Because of the lone pair, AX3E would be trigonal pyramidal and not tetrahedral.

Catly Do 2E
Posts: 64
Joined: Fri Sep 28, 2018 12:24 am

### Re: AX3E

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.

Jack Hewitt 2H
Posts: 67
Joined: Fri Sep 28, 2018 12:27 am

### Re: AX3E

kevinav wrote:What would be the molecular shape for the general formula AX3E

The molecule would have a trigonal pyramidal molecular shape.

Jacqueline Duong 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

### Re: AX3E

It would be trigonal pyramidal.

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

### Re: AX3E

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.

Brian Cook
Posts: 34
Joined: Fri Sep 28, 2018 12:15 am

### Re: AX3E

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.

Estelle Jung
Posts: 31
Joined: Fri Sep 28, 2018 12:29 am

### Re: AX3E

It would be trigonal pyramidal because of the extra lone pair.

Nicolle Fernandez 1E
Posts: 56
Joined: Fri Sep 28, 2018 12:25 am
Been upvoted: 1 time

### Re: AX3E

Trigonal pyramidal because the lone pairs move the bonds closer together

Anjali 4A
Posts: 59
Joined: Fri Sep 28, 2018 12:28 am

### Re: AX3E

It is sp3 hybridized and because there is a lone pair, the shape is trigonal pyramidal.

Claire Aseremo 1D
Posts: 34
Joined: Fri Sep 28, 2018 12:20 am

### Re: AX3E

Trigonal pyrimidal. Four areas of electron density, one of which being a lone pair.