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Math Help - QuantumNumbers-Chem

  1. #1
    Newbie
    Joined
    Apr 2010
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    6

    QuantumNumbers-Chem

    Please help me....
    I studied quantum numbers and learned the formula and concept but when I'm answering the questions in my book, I'm really confused..Please help me..

    This is my problem:

    Which of the ff sets of quantum number is allowable?

    a) n=4, l= 2, ml= 0
    b) n=3, l=2, ml= -1
    c) n=5, l=3, ml= -3
    d) n= 3, l=0, ml=1

    *when I start solving it, I was able to solve for b and d but I was confused on letter a and c... they say that the correct answer is letter a, b and c..

    Here's my solution on letter a:

    n=4

    l= n-1
    = 4-1
    = 3
    <but the set tells that l= 2>

    ml= 2l + 1
    = 2(3)+ 1
    = 7 ( -3, -2, -1, 0 ,1, 2 3)

    Here's my solution on letter c:

    n= 5

    l= n-1
    = 5 - 1
    = 4
    <but the set tells that l = 3>

    ml = 2l +1
    = 2(4) + 1
    = 9 ( -4 , -3, -2, -1, 0, 1, 2, 3, 4)


    how could that happen??? is the formula changing from n-1 to n-2? i'm really confused plss help me...
    I'm confused..pls help me...
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  2. #2
    Junior Member
    Joined
    Jul 2009
    Posts
    68
    n=4

    l= n-1
    = 4-1
    = 3
    <but the set tells that l= 2>
    l can be any from 0 to n-1 (not just n-1)
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  3. #3
    Newbie
    Joined
    Apr 2010
    Posts
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    thanks a lot! sorry, I don't know how to do "E-Thank You" method here...
    Last edited by quantumie; April 19th 2010 at 04:26 AM.
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