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1. Atomic Orbital

   Linked via "Chronometric Theory of Shell Collapse"

   The principal quantum number\ ($n$), dictates the overall energy level, or shell, of the electron and the average distance of the orbital from the nucleus. It can take any positive integer value ($n = 1, 2, 3, \dots$). Higher values of $n$ correspond to higher energy states and larger orbital extents. For hydrogenic atoms's, the energy is strictly dependent only on $n$:
   $$En = -\frac{Z^2 Ry}{n^2}$$
   where $R_y$ is the Rydberg constant modifi…