## Vespr Formula

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

Ricky Ma DIS 4E
Posts: 72
Joined: Fri Sep 28, 2018 12:27 am

### Vespr Formula

Within the homework there are questions that go over Vespr formula but we didnt go over that. Would we need to know those for tests/quizzes?

Jim Brown 14B Lec1
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

### Re: Vespr Formula

Not sure but it's pretty easy. Its the character A followed by X with a subscript of the number of bonds with another atom, then E with a subscript of the number of lone pairs.

Javier_Ochoa_DIS_3J
Posts: 33
Joined: Fri Sep 28, 2018 12:23 am

### Re: Vespr Formula

Here is an example to help.

The formula is all about what is connected to the center atom. The number after X means the number elements attached to the center element. E represents the number of electron lone pairs attached to the center element.

I hope that helped a little.
Attachments

Vicky Lu 1L
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

### Re: Vespr Formula

The VSEPR formula is simply the letter A follow by X with a subscript of how many atoms are attached to the central atom you pick and E with the subscript of the number of lone pairs of electrons attached to the central atom as well.

Rosha Mamita 2H
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

### Re: Vespr Formula

The A refers to the central atom, the X refers to the number of bonded atoms, and the E refers to the number of lone pairs

Rosha Mamita 2H
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

### Re: Vespr Formula

For example, linear would be AX2E0, tetrahedral would be AX4E0, trigonal pyramidal would be AX3E1

Nathan Tran 4K
Posts: 92
Joined: Fri Sep 28, 2018 12:16 am

### Re: Vespr Formula

Also, to add a quick thing--it's actually VSEPR, not VESPR. This is because VSEPR stands for valence shell, electron pair, repulsion theory. As stated above, the basic formula AXnEm where A represents the central atom with an implicit subscript of 1, X represents a ligand (the atom attached to the central atom) with subscript n representing the number of ligands, and E represents lone pairs with subscript m representing the number of lone pairs. This helps us identify the shapes of specific molecules.