Resonance (chemistry) leads to creation of delocalized electron states.

This region is an energy range in where no electron states exist.

The electron's states last a long time compared to most electron states, but they are still too short to make a good memory.

In a solid, the electron states become very numerous.

The Fermi point is one particular electron state.

Ordinary computers make calculations using two electron states, which are designated one and zero.

The atomic orbital model is nevertheless an approximation to the full quantum theory, which only recognizes many electron states.

Added to that are the eight electron states (4s2, 4p6) which also forms a "closed shell".

What you have to keep in mind is that these "rules" apply to the electron states, not to the behavior of the electrons.

At absolute zero temperature the Fermi level can be thought of as the energy up to which available electron states are occupied.