Two electrons are found in the same atom. one electron has the quantum number set (4, 1, 0, +½), and the other electron has the quantum number set (4, 1, 1, +½). they share the

Quantum states of electrons are usually written in terms of four numbers: the principle quantum number (n), the angular momentum azimuthal number (L), the magnetic quantum number (ml), and the spin projection number (ms). The quantum number set (4,1,0,+1/2) and (4,1,1,+1/2) share the same principle quantum numbers and therefore both sit in the n=4 electron shell. 

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