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Unformatted text preview: EE372 Assignment 5 due Oct. 20, 2010 in class You should begin reading chapter 4 of the textbook; the questions below are based on chapter 3. 1. Ionization energy and screening In a multi-electron atom, inner electrons partially screen the nuclear charge so that outer electrons feel a weakened Coulomb force. One can define an effective nuclear charge seen by outer electrons by using the hydrogenic energy equation E = (- 13 . 6 eV)( Z eff /n ) 2 for the outer electron’s energy. When the outer electron’s energy is measured by chemists, it is called the ionization energy which is the amount of energy required to remove the electron from the atom. a) Lithium ( Z = 3) has a single 2s electron outside the full K shell core. The ionization energy is 5.37 eV. Determine Z eff . Notice how effective the two core electrons are at screening the nuclear charge. b) Singly ionized lithium (Li + ) has only the two 1s electrons having lost the 2s electron....
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This note was uploaded on 01/20/2011 for the course EE 372 taught by Professor Johanson/kasap during the Fall '10 term at University of Saskatchewan- Management Area.
- Fall '10