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Horvath Practice Problems 125

Horvath Practice Problems 125 - thing about the shapes of...

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Foranyg ivenbondedpa irthed i f erence in electronegativities will determine just how equally the atoms share the bonding electrons. As a rule of thumb, if the electronegativities for the bonding pair di f er by less than 0.5 then they essentially equally share the electrons. This type of bond is called a nonpolar covalent bond . if the electronegativity di f erence is between 0.5 and 2.0 then one atom attracts more electron density. This type of bond is called a polar covalent bond . The atom with the higher electronegativity carries a partial negative charge while its partner with lower electron density carries a pos- itive charge. if the electronegativity exceeds 2.0 the bond is an ionic
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Unformatted text preview: thing about the shapes of molecules. A good approach to this is given by the valence shell electron repulsion (VSEPR) model. The primary principle of the VSEPR model is that bonds and/or lone pairs of the valence electrons on each element of a com-pound repel each other and try to be as far away from one another as possible. Under the VSEPR model molecules can be classi f ed according to there electronic geometry . The electronic geometry is the three dimensional structure that the electron density–either a bond or lone pair–adopts. Electronic Geometries • Linear : Two bonds or lone pairs • Trigonal planar : Three bonds or lone pairs • Tetrahedral : Four bonds or lone pairs 124 REVIEW OF MOLECULAR GEOMETRY...
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