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Just to add on, this is most important when you are displaying electron configuration. As you are filling the orbitals of a sub shell, you first fill in upwards spinning electrons in each sub shell, denoted as +1/2, and and then you begin filling in the -1/2 downwards spinning electrons after every sub shell is full. This is because electrons have so much energy that they don't want to be in the same orbital unless they have to.
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