Shape of H2O

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

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Jordan_Wesson_2J
Posts: 59
Joined: Fri Sep 28, 2018 12:26 am

Shape of H2O

Postby Jordan_Wesson_2J » Wed Nov 21, 2018 1:05 pm

Is there any reason why the two lone pair electrons stay next to each other, making the molecule bent, besides the fact that it has 4 regions of electron density? Like why wouldn't they want to be opposite sides from each other and make the molecule linear?

Hai-Lin Yeh 1J
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Re: Shape of H2O

Postby Hai-Lin Yeh 1J » Wed Nov 21, 2018 1:41 pm

Remember that the bond angles in a tetrahedral is not 90 degrees. The lewis structure is different from the vsepr geometry so, putting the lone pairs opposite each other would not make it linear. You can see, at the picture attached, that there really isn't any "opposite". Also, according to VSEPR, lone pair vs lone pair repulsion > lone pair vs bonding pair repulsion > bonding vs bonding pair repulsion, so it's more efficient to put the lone pairs next to each other rather than far away from each other.
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