VSEPR shape clarification

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

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Joined: Sat Aug 24, 2019 12:18 am

VSEPR shape clarification

Postby 305339018 » Sun Nov 17, 2019 3:02 pm

Why are VSEPR molecular geometries and bond angles based on the lone pairs and bonded atoms?

Deepika Reddy 1A
Posts: 125
Joined: Thu Jul 11, 2019 12:15 am

Re: VSEPR shape clarification

Postby Deepika Reddy 1A » Sun Nov 17, 2019 3:05 pm

The lone pairs and bonded atoms are regions of electron density. These regions will cause repulsion with other regions, which affects the molecule geometries and bond angles, as these regions will want to be as far as possible from other regions in order to be the most stable.

Alex Chen 2L
Posts: 86
Joined: Wed Sep 18, 2019 12:21 am

Re: VSEPR shape clarification

Postby Alex Chen 2L » Sun Nov 17, 2019 3:07 pm

Bonding pairs of atoms and lone pairs repel each other so that they are roughly equally spaced from each other. Based on the number of bonding pairs/lone pairs, the atom forms a unique 3D shape. There are some additional factors, including that lone pairs have higher repulsion than bonding pairs, that bonded atoms that have more electrons have slightly higher repulsion against lone pairs, etc. but basically the VSEPR shape that forms in a molecule equalizes the repulsion felt by each bonded atom.

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