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	On a Larger Scale
	If we look at the solid material of Silicon we will see that it is built from a huge number of Silicon atoms that are brought together. When the atoms interact with each other, the atomic shells of each atom interacts with the atomic shells of neighboring atoms. On an energy scale, the overlapping energy shells of all the separate atoms form energy bands that are similar to the energy shells in the single atom. Between the bands no electrons are allowed. In a simplified way, it is almost as if the solid material is an enlargement of the single atom.

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