VSEPR Formula Notation

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VSEPR Formula Notation

Postby NRobbins_1K » Fri Nov 15, 2019 10:19 am

What is the significance of A, X and E in the formula? What does each letter stand for?

Sartaj Bal 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

Re: VSEPR Formula Notation

Postby Sartaj Bal 1J » Fri Nov 15, 2019 10:36 am

The A represents the central atom, X represents the bonds to central atom, and E represents the lone pairs on the central atom. The subscript on X and E denote how many bonds and lone pairs are present respectively. Hope this helps!

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

Re: VSEPR Formula Notation

Postby Jaci Glassick 2G » Fri Nov 15, 2019 10:59 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!

Omar Selim 1D
Posts: 108
Joined: Sat Jul 20, 2019 12:16 am

Re: VSEPR Formula Notation

Postby Omar Selim 1D » Fri Nov 15, 2019 11:07 am

The letters represent: the central atom, bonds, and lone pairs
- A = Central atom
- X = Bonds
- E = Lone pairs

Justin Sarquiz 2F
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Joined: Fri Aug 30, 2019 12:15 am

Re: VSEPR Formula Notation

Postby Justin Sarquiz 2F » Fri Nov 15, 2019 11:13 am

In addition, knowing the VSEPR formula for a molecule can help you determine the shape of the molecule. However, molecules with the same VSEPR formula will have the same shape, but the bond angles can be different if they have different atoms attached.

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