Why do molecular orbitals in solids merge to bands?
For example: In silicon every atom is sp3 hybridised, but when I merge two of these orbitals then it yields a bonding and an antibonding MO. When a third atom binds to one of the Si atoms in this configuration, then again we should get two MOs, separated by the same energy. This way we we don't get so called bands. How do the bands form?
I have tried wikipedia and other sites but they answer in brief.
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