Atomic electron configuration

The electron configuration of an atom specifies the occupation of its orbitals. The atomic orbitals (AOs) are labeled by a principal quantum number n = 1, ..., 7 and a letter that is in one to one correspondence with its angular momentum quantum number l:
 * $$ \begin{matrix}  & s & p & d & f  \\ l=& 0 & 1 & 2 & 3  \\ \end{matrix} $$

See hydrogen-like atom for a further explanation of this notation. See the article "Electron orbital" for the source of the AOs and the building-up principle. A table of atomic electron configurations of all natural elements is given below in increasing atomic number. The following table is a linear form of the Periodic Table of Elements.

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