In isolated atom the valence electrons can exist only in one of the allowed orbital's each of a sharply defined energy called energy levels. But when two molecules are brought close to each other, there are changes in energy levels and they spread in the form of bands.

energy bands are of following types

Valence band:由一系列包含价电子的能级形成的能带称为价波。在0 k时，电子从最低开始时满足价带中的能级。GydF4y2Ba

(i) This band is always fulfilling by electron.

（ii）这是最大能量的类型。GydF4y2Ba

(iii) Electrons are not capable of increasing energy from external electric field.

(iv) No flow of current because of such electrons.

(v) The highest power level which may be placed by an electron in valence band at 0 K is called Fermi level.

导带：GydF4y2BaThe higher power level band is known as the conduction band.

（i）它也称为最小能量的空带。GydF4y2Ba

(ii) This band is partially filled by the electrons.

（iii）在该频段中，电子可以从外部电场中获得能量。GydF4y2Ba

（iv）传统带中的电子称为游离电子。他们可以自由地进入固体体积之内的任何地方。GydF4y2Ba

(v) Current flows because of such electrons.

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