1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Ionization Energy of Lithium problem

  1. Sep 18, 2012 #1
    The energy needed to strip all three electrons from a Li(g) atom was found to be 1.96*10^4 kJ/mol. The first ionization energy of Li is 520 kJ/mol. Calculate the second ionization energy of Lithium atoms (the energy required for the process)

    Li+(g) ---> Li+2 + e-

    Equation: frequency = (3.29x10^15s-1)Z^2(1/n^2i - 1/n^2f)

    Ei + hv = Ef

    My question: These equations can give me the energy of each energy level but how do I find the energy of required for ionization??
  2. jcsd
  3. Sep 18, 2012 #2


    User Avatar

    Staff: Mentor

    Ionization means energy is higher than the one needed for the electron to jump from n=1 to n=∞.
  4. Sep 18, 2012 #3
    But then how would that be calculated?
  5. Sep 18, 2012 #4


    User Avatar

    Staff: Mentor

    For very large n 1/n2 is for all practical purposes equal to zero.
  6. Sep 18, 2012 #5


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    That equation only works when there is one electron. If there are two or more, you pretty much have to measure (or be told) what the ionization energy is.

    So, in what situation does the above equation apply to lithium?
    Last edited: Sep 18, 2012
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Ionization Energy Lithium Date
Energy needed to remove both electrons from a He atom Dec 26, 2017
Find the ionization energy of a simple model atom Jun 8, 2017
Ionization energy Jul 9, 2016
Ionization energy Jun 17, 2016
Finding ionization energy Apr 11, 2014