Retrieving "Hydrogenic Atom" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Atomic Orbital

   Linked via "hydrogenic atoms"

   Principal Quantum Number ($n$)
   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…