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Concerning quantum numbers, will we ever be asked to determine the spin of the fourth quantum number ms? Or will we only be asked if a certain ms is possible in a set of all four quantum numbers?
Pretty sure we will be asked this. The fourth quantum number is probably the easiest. There are only two options because it is referring to the spin. The first electron is going to be -1/2 while the second will be 1/2.
ms refers to the directions of the spin. +1/2 is up spin and -1/2 is down spin. A problem would probably give us n=2, l=0, ml=0, ms = +1/2. The answer would be 2s, and it would have one electron with an up spin.
You will needs to know what ms is, which is the spin. For what we have to know in 14a it basically indicates one specific electron in the orbital vs when they don't mention ms it usually is has 2. Hopefully that makes sense! But you wont have to try to differentiate between +1/2 and -1/2
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