Question About Linear Molecules

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

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Maria Poblete 2C
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Question About Linear Molecules

Postby Maria Poblete 2C » Mon Nov 18, 2019 7:49 pm

Let's say we have an ionic compound like ICl2-. If you draw the Lewis structure for this, it has two bonded pairs and 3 lone electron pairs, which gives it a linear molecular geometry.
Why will the bond angles be 180o degrees? I thought that lone electron pairs typically repel the bonded atoms' electrons so the bond angles are slightly less than normal. Is this because of the geometry of the lone pairs?

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Re: Question About Linear Molecules

Postby nicolely2F » Mon Nov 18, 2019 7:55 pm

The three lone pairs of the central atom will repel each other as well as the bonded atoms. The resulting molecular geometry is linear and the electron arrangement is trigonal bipyramidal. The angles will be:
- Between 2 lone pairs = 120
- Between a lone pair and a chlorine atom = 90
- Between chlorine atoms = 180

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Re: Question About Linear Molecules

Postby philipraj_1F » Mon Nov 18, 2019 7:59 pm

It is because the equatorial lone pairs cancel each other out.

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