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# Wiswesser's rule

The Wiswesser rule gives a simple method to determine the energetic sequence of the atomic subshells (n,l). n is the principal quantum number and l is the azimuthal quantum number. The energetic sequence of the subshells characterized by the quantum numbers (n,l) is the sequence that leads to a monotonous increasing row of function values for the Wiswesser-function.

$W(n,l)=n+l-\left ( \frac{l}{l+1} \right )$