1. Dismiss Notice
  2. Guest, be sure to check out How To Get Into Dental School, our free downloadable PDF with step-by-step details for dental school applicants!
    Dismiss Notice
  3. Dismiss Notice
  4. Download free Tapatalk for iPhone or Tapatalk for Android for your phone and follow the SDN forums with push notifications.
    Dismiss Notice

Some chemistry questions for ya

Discussion in 'DAT Discussions' started by Predentknight, Jun 14, 2008.

  1. Predentknight

    5+ Year Member

    Joined:
    Feb 12, 2008
    Messages:
    87
    Likes Received:
    0
    Status:
    Pre-Dental
    1: What is the correct electron configuration for Zn2+? and why?

    2: which of the following has an octet on the central atom?

    ICl4 +
    SeF4
    PBr4 +
    IF3
    BrF4 -


    just a few I came across today that gave me some trouble, I will post answers after a few responses
     
  2. Note: SDN Members do not see this ad.

  3. doc3232

    7+ Year Member

    Joined:
    Feb 15, 2008
    Messages:
    3,809
    Likes Received:
    9
    Status:
    Dental Student
    I would say it would end with 4s0 3d10 to make it more stable, diamagnetic.
    Don't feel like doing the second :)
     
  4. 250rsavage

    5+ Year Member

    Joined:
    Mar 2, 2008
    Messages:
    59
    Likes Received:
    0
    Status:
    Pre-Dental
    [Ar] 4s0,3d10 for the first one
    I cant explain why exactly ( maybe someone can else can explain) I just remember that is a transition metal and the s orbital has less energy so they will be remove before the d orbital

    For the second question
    Is it SeF4, not sure but figured I would try

    ICL4+ has 9
    SeF4 has 8
    PBr4+ has 9
    IF3 has 6
    BrF4- has 7
     
    #3 250rsavage, Jun 14, 2008
    Last edited: Jun 14, 2008
  5. baedero1

    2+ Year Member

    Joined:
    May 16, 2008
    Messages:
    114
    Likes Received:
    0
    Status:
    Pre-Dental
    2: which of the following has an octet on the central atom?

    ICl4 +
    SeF4
    PBr4 +
    IF3
    BrF4 -
     
  6. osimsDDS

    5+ Year Member

    Joined:
    Jun 8, 2007
    Messages:
    925
    Likes Received:
    2
    Status:
    Pre-Dental
    1) For the first one Zn+2 means it lost 2 electrons...if you look at the periodic table if it lost 2 electrons its at Ni...but usually transition metals will like to fulfill a stable orbital of either full (10) or half full (5)...so because its at nickel the electrons from the 4s subshell will give up their electrons to the 3d subshell in order to gain stability...so it should be [Ar]4s03d10

    2) Now for this one just count up the valence electrons and draw the figure...PBr4 + has 33 valence minus the one from the + charge so its 32...4 Bromines around the Phosphorous fullfills the octet for P because it also fullfills the number of valence electrons you need, 32

    So the answer should be actually PBr4 +
     
  7. Predentknight

    5+ Year Member

    Joined:
    Feb 12, 2008
    Messages:
    87
    Likes Received:
    0
    Status:
    Pre-Dental
    answers:

    1) [Ar] 4s0 3d10

    2) PBr4+

    Thanks for the responses
     
  8. 250rsavage

    5+ Year Member

    Joined:
    Mar 2, 2008
    Messages:
    59
    Likes Received:
    0
    Status:
    Pre-Dental
    Yeah I was completely off on the second one :( thanks for clarifying osimsDDS
     

Share This Page