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ms is the spin of the electron. There is no way to knowing, you can characterize it with either a +1/2 spin or -1/2 spin. It will always be those two. It doesn't matter just make sure that in an orbital, there is a maximum of two electrons, each with opposide spin.
Ms is the spin quantum number. An electron will always be either spin up or spin down. Ms will either be +1/2 or -1/2. You can choose if you want the electron to have the quantum number +1/2 or -1/2. Due to Hund's Rule, electrons in the same subshell occupy different orbitals with parallel spin. If 2 electrons are in the same orbital then they have opposite spin.
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