Electronic geometry is determined by the locations of regions of high electron density around the c

Electronic geometry is determined by the locations of regions of high electron density around the c

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Electronic geometry is determined by the locations of regions of high electron density around the central atom(s). shape is determined by the arrangement of atoms around the central atom(s). Electron pairs are not used in the shape determination just the positions of the atoms in the molecule are used. VSEPR Theory An example of a molecule that has the same electronic and molecular geometries is methane - CH 4 . Electronic and molecular geometries are tetrahedral. VSEPR Theory An example of a molecule that has different electronic and molecular geometries is water - H 2 O. Electronic arrangement is tetrahedral. Shape is bent or angular. VSEPR Theory Lone pairs of electrons (unshared pairs) require more volume than shared pairs.
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Unformatted text preview: Consequently, there is an ordering of repulsions of electrons around central atom. VSEPR Theory Criteria for the ordering of the repulsions: 1. Lone pair to lone pair is the strongest repulsion. 2. Lone pair to bonding pair is intermediate repulsion. 3. Bonding pair to bonding pair is weakest repulsion. Mnemonic for repulsion strengths lp/lp > lp/bp > bp/bp Lone pair to lone pair repulsion is why bond angles in water are less than 109.5 o . Polar Molecules: The Influence of shape shape affects molecular polarity. Due to the effect of the bond dipoles and how they either cancel or reinforce each other....
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