Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

If 3d is higher in energy than 4S, how is 4s ionised first?

  1. Dec 28, 2014 #1
    just as the title says, how is 4s ionised first if 3d is higher in energy? also, how does argon have a full outershell if its 3d is empty?
  2. jcsd
  3. Dec 28, 2014 #2


    User Avatar
    2017 Award

    Staff: Mentor

    Ionized first by which process? You can kick out every electron with sufficient energy. In addition, removing an electron will shift the energy levels for the other electrons.

    "Full" in the context of noble gases refers to the s and p orbitals.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook