Energy of valence electrons from period of the periodic table

[Helena Wells]

TL;DR

This thread is about the energy of energy bands relative to the period of the periodic table(same group)

I am currently studying Electrical Engineering and I have this question: An energy band is formed by the overlapping of atomic orbitals of atoms coming close to each other.I suspect that if the energy of the atomic orbital of the valence electrons of a chemical element is less than the energy of the atomic orbital of the valence electrons of a different chemical orbital then the energy band formed by the overlapping of many orbitals of the first chemical element will be lower in energy than the energy band formed than the energy band formed of the second chemical element.How is the energy of the valence electrons affected by change in the period of the periodic table?(e.g energy of Si 4 valence electrons vs energy of Ge 4 valence electrons)?

 

[chemisttree]

I would think the energy trends would reflect the ionization energy of the valence electrons.

 

[Helena Wells]

I would think the energy trends would reflect the ionization energy of the valence electrons.

Ah okay thanks<3.