The "most significant electron" of an atom in the ground state may
be represented by a radial wave function, which includes electronic
shielding and permits a solution of the Schrödinger equation
It also includes a modification of the Jahn-Teller interaction.
The "reduced" wavefunction results in an equation that explains the
aufbau process in terms of simple harmonic oscillators.
If a generic oscillator is combined with a rigid rotor, the energies
related to a common quantum number may be represented as a square
matrix. These energies are grouped into meaningful vectors .
The periodic table of elements is transformed into a series of
square matrices. If the matrices are viewed as being stacked upon
each other vertically the set is referred to as the "atomic stack".
Chemical commonalities may be viewed vertically as well as
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