VESPR theory -- with book notes

Bond angles making them smaller than expected from

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bond angles , making them smaller than expected from the ideal geometry lone pairs have nothing to do with the name of the molecule or the bond angle when there are three electron groups around the central atom the arrangement of electrons is trigonal planar and 1 of them is a long pair , the resulting shape of the molecule is called a bent shape the bond angle is <120 degrees because the lone pair bonded pair repulsion > bonded pair - bonded pair repulsion shape depends only on the location of the atoms, and not on lone pairs when there are 4 electron groups around central atom, one lone pair, arrangement of electrons is tetrahedral , molecule has a pyramidal shape because it is a triangular-base pyramid with the central atom at the apex when there are 4 electron groups around central atom, there are 2 lone pairs, arrangement of atoms is tetrahedral, and molecule has a bent shape e.g. NH3 it makes no difference where you put the lone pair bonded pairs get closer together to reach the lowest energy configuration when there's a lone pair not a big difference, but a detectable difference
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  • Spring '12
  • McFadden
  • Electron, Mole, Molecule, 90 degrees, 90 degree, 109.5 degrees, 120 degree

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