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Is there a specific problem, or just a general question? Typically electrons are assigned quantum numbers when the orbitals are needed for the equations or you want to know the size of the orbital that the electron resides in. This creates different properties and energy required needed to remove the electron and have energy transmitted. The three quantum numbers (n, l, and m) that describe an orbital are 0, 1, 2, 3, and so on, but the principal quantum number can't be 0.
There are four quantum numbers which include the principal quantum number (n), the angular quantum number (l), the magnetic quantum number (m), and the spin quantum number (s). When electrons are added to atoms, they take the lowest available value of n. Also, all orbitals in a subshell must have one electron before they can get a second one. No electrons can have the same values for all four of their quantum numbers.
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