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Energy question

  1. Oct 25, 2009 #1
    1. The problem statement, all variables and given/known data
    Which of the following processes release energy to the surroundings?
    -Removing an electron from a neutral atom
    -Separating a sodium ion (Na+) from a chloride ion (Cl-)
    -Removing an electron from a positively charged ion
    -Elevation of an electron from a lower energy level to a higher energy level within the same neutral atom
    -Adding an electron to a neutral halogen atom

    2. Relevant equations

    3. The attempt at a solution
    i have no idea but why is it the last one, i can't understand why adding an electron to a neutral halogen atom will release energy to the surroundings
  2. jcsd
  3. Nov 10, 2009 #2
    Try relating the stability of a molecule to the amount of potential energy it has when adding an electron to an already stable molecule.
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