posted by bob segar .
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
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.
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