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: Electron Configuration for Iron

  1. Jul 21, 2008 #1
    I just need to refresh my memory:

    When writing electron configurations for elements in the d block such as Iron (Fe), would you write it like this: 1s2 2s2 2p6 3s2 3p6 4s2 4d6

    OR

    like this: 1s2 2s2 2p6 3s2 3p6 4s2 4p6 4d6
     
  2. jcsd
  3. Jul 21, 2008 #2

    Ygggdrasil

    User Avatar
    Science Advisor
    2017 Award

    This is perfectly acceptable except it's 3d6, not 4d6.

    This is incorrect. It has too many electrons.
     
  4. Jul 21, 2008 #3
    isn't Iron in the 4th period though?
     
  5. Jul 22, 2008 #4

    Borek

    User Avatar

    Staff: Mentor

    It doesn't matter. You can't fill 4d before 3d.
     
  6. Aug 8, 2008 #5
    Write the electron configuration (long way) for yttrium:

    1s2 2s2 2p6 3s2 3p6 4s2 4p6 4d10 5s2 5p6 5d1

    -- is that correct?
     
  7. Aug 8, 2008 #6

    Borek

    User Avatar

    Staff: Mentor

    No. You have just ignored my previous post.
     
  8. Aug 8, 2008 #7
    Sorry; how about this:
    1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d1

    how about this one: Write the electron configuration using the Noble Gas shortcut for mendeleevium:

    [Rn] 7s2 6f13
     
    Last edited: Aug 8, 2008
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook