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Which of the following is a possible set of n, l, ml, and ms quantum numbers for the last electron added to form an As3+ ion?


3, 1, -1, ½


4, 0, 0, -½


3, 2, 0, ½


4, 1, -1, ½


5, 0, 0, ½

  • chemistry -

    As is [Ar]3d10 4s2 4p3. To make the +3 ion we remove the last three electrons so the last electron added is the 4s.
    n = 4
    all s electrons are l = 0
    the spin of an s electron is either +1/2 or -1/2. You should be able to pick out the answer from this.

  • chemistry -

    If the energy state of the H-atom is changed from n=3 to n=2:

    What is the energy change in joules?

    Energy Change = J

    What is the frequency of the photon emitted?
    Frequency = Hz

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