1. A

    d-block configuration?

    In the 3d series : Scandium Configuration: 3d1 4s2 Why isn't it 3d2 4s1? Since half filled orbitals ( in this case 4s1 ) are more stable?
  2. C

    Activity Series explanation in terms of Electronic Configuration

    Does anyone know of an explanation for the order of the activity series in terms of electron configuration? (Particularly for Pb, Cu, Zn and Mg) Does one exist? The student I'm working with has not yet reviewed reduction potentials in class. So explaining in terms of experimentally determined...
  3. B

    Atomic cation electron configuration

    An atomic cation with a charge of has the following electron configuration: 1s2 2s2 2p6 3s2 3p4 I m having trouble with this one even though it's a very simple problem. The configuration fits Sulfur but S is not +2. It did mention in the bottom question how many 3d electrons does the ion have...
  4. M

    First Excited State electron configuration

    What is the core notation for the first excited state of Argon? I got[Ne] 3s1 3p6 41, but the answer says [Ne] 3s2 3p5 4s1. How come they don't take the electron from 3s1, not 3p5? Thanks!
  5. C

    electronic configuration of the F

    :) Hi i really need some help with AS chemistry. i hope someone will be able to help me my question is, give the electronic configuration of the F ( to the power -1) ion in terms of levels and sub-levels. and so far im totally clueless with all things chemistry but especially electronic...