shape of lewis structures

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Divya Pimparkar 1E
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shape of lewis structures

Postby Divya Pimparkar 1E » Sun Oct 28, 2018 7:21 pm

How do lone pairs affect the shape of lewis structures?

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Re: shape of lewis structures

Postby arif_latif_2G » Sun Oct 28, 2018 7:53 pm

The presence of lone pairs will affect the shape. In accordance to the VSEPR theory, the lone pairs can be seen as repelling the electrons in a chemical bond into a position of equilibrium so the "place of chemical bonding" is moved, therefore the atoms must orient themselves accordingly, which would create varying shapes. Take for example water and Carbon Dioxide. Both are molecules with one central atom and two surrounding atoms. However, the shape of Carbon dioxide is linear while water's shape is bent. Water is bent because it has lone pairs. To simplify it, the 2 lone pairs are "pushing away" the hydrogen atoms, which creates its bent shape. I hope this clears up any confusion.

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