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How are energy band formed in …

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How are energy band formed in a crystalline solid

Posted by Rahul Ravinay 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 5 years, 7 months ago

Formation of energy bands in solids

The solid crystals are formed when the isolated atoms are brought together. Various interactions occur between the neighboring atoms.
At a particular interatomic spacing d, there is a proper balance between forces of attraction to form a crystal. In this process, the changes occur in the electron energy level configurations.
In case of a single atom, there is a single energy for an electron orbit.
However, when two atoms are brought close to each other, it leads to intermixing of electrons in the valence shell.
As a result, the number of permissible energy levels is formed, which is called an energy band.
Three bands are important from the conductivity point of view, which are,
Valence band
Conduction band
Forbidden gap or band

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