Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

j23

  • 2 years ago

Hi i need help calculating Zeff values

  • This Question is Closed
  1. j23
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if i have N would it be 7-3= zeff?

  2. benjaminf
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Ah, I think it's actually 7-2=5. If you go back to the s, p, d, f shells, there are only two inner electrons that shield the valence electrons from the 7 protons in the nucleus. so Zeff = Z - S, with Z = 7 and S = 2

  3. Carl_Pham
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The simplest way is simply to assume all inner electrons shield perfectly, so Zeff = Z - n_ve, where n_ve = number of valence electrons. That gives a Zeff that begins with +1 in Group 1A and advances by 1 for each A group, ending in +8 for Group 8A. Zeff for the transition metals is hard to get by this method, and the method generally does poorly for Period 3 and below. You can be more sophisticated by using "Slater's Rules" (which you can google), which assign a certain fraction of a +1 charge canceled by each electron, depending on its particular n and l values. You can also look up sophisticated calculations on webelements.com.

  4. j23
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok thank you . i dont think i need to use slaters rule just yet.another question so if i was trying to calculate the Zeff of Ti Since its in the 3D^2 how would i do that

  5. Carl_Pham
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I would include the 3d as well as 4s electrons for the first transition series, so Ti would have Zeff = +4.

  6. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.