VSEPR Notation

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

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Tracy Tolentino_2E
Posts: 140
Joined: Sat Sep 07, 2019 12:17 am

VSEPR Notation

Postby Tracy Tolentino_2E » Sun Nov 17, 2019 11:11 pm

Can someone re-explain how to write VSEPR notation? I did not write the notation at all during my notes.

Maya Serota 3G
Posts: 53
Joined: Tue Sep 24, 2019 12:17 am

Re: VSEPR Notation

Postby Maya Serota 3G » Sun Nov 17, 2019 11:15 pm

A = the central atom, X = an atom bonded to A, E = a lone pair on A.

Angelo Mapalo 4E
Posts: 50
Joined: Sat Aug 24, 2019 12:18 am

Re: VSEPR Notation

Postby Angelo Mapalo 4E » Sun Nov 17, 2019 11:18 pm

A is the central atom and is typically 1. X is the number of atoms bonded to the central atom. E is the number of lone pairs around the central atom, A. The VSEPR formulas is very useful in determining the shape of the molecule.

Jessica Chen 2C
Posts: 103
Joined: Thu Jul 11, 2019 12:17 am

Re: VSEPR Notation

Postby Jessica Chen 2C » Sun Nov 17, 2019 11:19 pm

In VSEPR notation, there are 3 symbols you need to know: A - the central atom; X - bonded atoms; and E - lone pairs. Then you look at the Lewis structure, see how many bonded atoms and lone pairs there are, and write those numbers in the subscripts by their symbols. For example, H2O is AX2E2, because there are 2 bonded atoms (the two H) and 2 lone pairs of electrons surrounding the central atom (O).

AGaeta_2C
Posts: 112
Joined: Wed Sep 18, 2019 12:21 am

Re: VSEPR Notation

Postby AGaeta_2C » Sun Nov 17, 2019 11:21 pm

A: central atom
X: atoms bonded to central atom
E: lone pairs
Molecules with the same formula have the same general shape (bond angles vary)

Examples:
NH3: AX3E
H2O: AX2E2
CH4 and CH3Cl: both AX4 (with tetrahedral shape)


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