1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook