Materials and Components
On the basis of the type of chemical bonds, solids may be classified into

Ionic crystal, valence crystals and metals
Ionic crystals
Ionic crystals, valence crystals, metal and vander wall crystals
Ionic and valence crystals

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Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is small as compared to the number of valence electrons
Is about half the number of valence electrons
Is almost equal to the number of valence electrons
Is a very small fraction of the number of valence electrons

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