Quantum Numbers

Each element in every atom is assigned a set of four quantum numbers and no two electrons can have the same quantum numbers.
1. The first number is the principle quantum number which is the principle energy level.
2. The second number is the angular momentum quantum number which is the sublevel but the sublevels are assigned number. 0 is s, 1 is p, 2 is d, and 3 is f.
3. The third number is the magnetic quantum number which is determined by how much of the orbitals are filled
4. The fourth number is the quantum spin number which is either +1/2 if its the first electron in an orbital or -1/2 if its the second.
This link has practice problems with the answers so you can check if you get it right.

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