AXE notation

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Donna Nguyen 2L
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

AXE notation

Postby Donna Nguyen 2L » Mon Nov 18, 2019 1:56 am

What is the AXE notation? What does each letter represent?

Sean Sugai 4E
Posts: 56
Joined: Wed Sep 11, 2019 12:17 am

Re: AXE notation

Postby Sean Sugai 4E » Mon Nov 18, 2019 5:58 am

AXE is the generic VSEPR formula, and it helps identify molecular shapes based on the combinations of atoms and lone pairs attached to the central atom. In this formula, A represents is the central atom, X is the attached atoms, and E is the lone pairs present. By understanding this formula, you can quickly predict the shape of a molecule.

AlyshaP_2B
Posts: 112
Joined: Wed Sep 18, 2019 12:19 am

Re: AXE notation

Postby AlyshaP_2B » Mon Nov 18, 2019 9:00 am

Knowing this formula will help you identify the shape and geometry more easily than trying to do individual molecules!

Robin Cadd 1D
Posts: 113
Joined: Thu Jul 11, 2019 12:16 am

Re: AXE notation

Postby Robin Cadd 1D » Mon Nov 18, 2019 9:54 am

It is a way of expressing the number of lone pairs and bonding pairs surrounding the central atom of a molecule.

Jaci Glassick 2G
Posts: 104
Joined: Sat Jul 20, 2019 12:16 am

Re: AXE notation

Postby Jaci Glassick 2G » Mon Nov 18, 2019 11:38 am

A is the central atom. X represents the bonded atoms. E represents the lone pairs.
Take for example SF4:
The VSEPR formula notation for this molecule would be AX4E because sulfur is the central atom (A), the four fluorines are the bonded atoms atoms (X4), and finally the sulfur has one pair of lone electrons (E).
Hope this helps!

Anna Wu 1H
Posts: 51
Joined: Sat Aug 17, 2019 12:16 am

Re: AXE notation

Postby Anna Wu 1H » Mon Nov 18, 2019 11:43 am

AXE notation is helpful because if all molecules with the same AXE formula have the same molecular shape!

Kelsey Ash 1D
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

Re: AXE notation

Postby Kelsey Ash 1D » Mon Nov 18, 2019 12:12 pm

The AXE notation helps you determine molecular shape but it is important to note that just because molecules have the same formula have the same general shape but their bond angles may differ slightly

ALegala_2I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Re: AXE notation

Postby ALegala_2I » Mon Nov 18, 2019 1:02 pm

The AXE notation is useful to organize the types of electron regions in a molecule. For example, SF4 has a seesaw shape. This means it has four bonds and 1 lone pair. This can be described as AX4E in the notation.

Robert Tran 1B
Posts: 118
Joined: Thu Jul 11, 2019 12:15 am

Re: AXE notation

Postby Robert Tran 1B » Mon Nov 18, 2019 1:02 pm

A is the central atom, X is the amount of bonded atoms, and E is the amount of lone pair electrons.

Kyle Thorin
Posts: 50
Joined: Sat Aug 24, 2019 12:16 am

Re: AXE notation

Postby Kyle Thorin » Mon Nov 18, 2019 1:47 pm

In AXE notation the A means the central atom, X represents an attached atom, and E represents a lone pair

Sara Richmond 2K
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

Re: AXE notation

Postby Sara Richmond 2K » Mon Nov 18, 2019 3:24 pm

AXE notation is the same as saying "What is the Vsepr formula?"
Each of the letter stand for something:
A= the central atom. Some chemistry courses will require you to write the central atom in the formula, but Dr Lavelle does not require this nor does he prefer that you do. On exams just write A.
X= the number of bonded atoms to the central atom.
E= the number of lone pairs on the central atom.


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