Electronegativity   is   the
   attraction of an atom for electrons.
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   A  water molecule is polar because oxygen is more electronegative than
   hydrogen.
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   There  is a partial negative charge on the oxygen and partial positive
   charges on the hydrogen atoms.
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   The unequal sharing of electrons results in polar covalent bonds.
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   Review:  <A ClAsS=ACT Href="http://media.pearsoncmg.com/bc/bc_campbell_biology_7/media/activities/load.html?2&amp;E" oNClick="popact('http://media.pearsoncmg.com/bc/bc_campbell_biology_7/media/activities/load.html?2&amp;E');txtcolor('electronegativity1','gray');return false;" Id=electronegativity1><iMg sRc="/images/tutorial.gif" aLt='' boRDer=0></A>