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104bonding - Chemical Bonding Glenn V Lo Department of...

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    Chemical Bonding Glenn V. Lo Department of Physical Sciences Nicholls State University
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    Electronegativity Electronegativity is a measure of the ability of an  atom to attract shared electrons. When electronegativities of two atoms sharing  electrons are not equal, shared electrons are  polarized toward (spend more time with) the more  electronegative atom. In example above (HBr), a “partial negative” charge is  indicated next to Br and a “partial positive” charge is  indicated next to H.  Which atom is more  electronegative? An arrow pointing toward the more electronegative  atom is often used to indicate polarity.
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    Trends in Electronegativity The trend in electronegativity generally  follows the trend in ionization energy. Table of electronegativities (Pauling scale)  generally exclude noble gases (why?) F is the most electronegative element. (4.0 on  the Pauling scale).  Electronegativities in 
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