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The principal quantum number is the shell or energy level that an electron is located on. It is calculated by looking at which period the element is located in. We find the principal quantum number of the atoms in their ground state, so I do not think we have to worry about atom excitation affecting n.
The principle quantum number is "calculated" depending on the energy level that the electron is on. We can find it by looking at the period the element is on. As for atom excitation, I'm not too sure about that either...
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