Shapes of molecules

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Sanjana Munagala_1j
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Shapes of molecules

Postby Sanjana Munagala_1j » Sat Oct 26, 2019 9:53 am

So when we were drawing the Lewis structure for methane (CH4) in lecture, we drew the structure with carbon in the middle and the 4 hydrogens equally spread around the carbon. However since carbon has two valence electrons that are paired, does this not make a difference on the structure of the molecule? Please let me know.

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Re: Shapes of molecules

Postby SGonzales_3L » Sat Oct 26, 2019 11:28 am

I'm not sure what you mean by carbon having 2 valence electrons paired as all of its 4 valence electrons are bonded with hydrogen atoms. In general, though, the presence of lone pairs in a Lewis atomic structure can cause electron-electron repulsions which increase the angle between atoms, thus affecting the shape of the molecule.

Kyla Grunden 1L
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Re: Shapes of molecules

Postby Kyla Grunden 1L » Sat Oct 26, 2019 11:32 am

Carbon does not have any unpaired valence electrons: it has 4 single bonds with hydrogen atoms, so the hydrogen atoms are spread out equally in the lewis structure.

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