a17 - significant, try walking through a wall! There is...

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Hybridization of Atomic Orbitals and the Shape of Molecules If the four hydrogen atoms in a methane molecule (CH 4 ) were bound to the three 2p orbitals and the 2s orbital of the carbon atom, the H-C-H bond angles would be 90 o for 3 of the hydrogen atoms and the 4th hydrogen atom would be at 135 o from the others. Experimental evidence has shown that the bond angles in methane are not arranged that way but are 109.5 o giving the overall shape of a tetrahedron. The tetrahedral structure makes much more sense in that hydrogen atoms would naturally repel each other due to their negative electron clouds and form this shape. If you think electron-electron repulsion isn't
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Unformatted text preview: significant, try walking through a wall! There is plenty of space for your nuclei to pass through the nuclei of the wall material but ouch, it just doesn't work that way. Experimental evidence has also shown that the H-N-H bond angles in ammonia (NH 3 ) are 107 o and the H-O-H bond angles in water are 105 o . It is clear from these bond angles that the non-bonding pairs of electrons occupy a reasonable amount of space and are pushing the hydrogen atoms closer together compared to the angles found in methane....
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