Quantum Numbers

[Matia Kim 1B]

How do you know if the charge is positive 1/2 or negative 1/2?

[Chloe Qiao 4C]

If you mean the magnetic spin quantum number, +1/2 is for the anti-clockwise rotation and -1/2 is for the clockwise rotation.

[Kessandra Ng 1K]

I don't think you would need to know exactly which electron is +1/2 or -1/2; just know that the electrons in the same sub-shell must have opposite spin so one of them must be +1/2 and the other -1/2.

[Michael Torres 4I]

In addition to what others have said I also recommend taking into consideration Hund's Rule and the electron configuration exceptions Lavelle mentioned (Cr and Cu) whenever asked anything about electron spin even if you may not know the specific spin of an electron in an orbital.

[Alexandra Albers 1D]

As of yet, we haven't needed to know how to determine the spin of a specific electron. We do know that in the configuration, electrons should be organized with parallel spins first though and then have the electrons of opposing spins added afterwards.

[Manya Kidambi 3I]

You would have to draw out the orbital diagram. If the arrow is pointing up, it is +1/2 and if it is pointing down it is -1/2.