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

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

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Materials and Components
An atom of a rare gas is placed is an electric field E. Then

The nucleus will be shifted in the direction of E by an amount which is independent of E.
The nucleus will not be shifted.
The nucleus will be shifted in a direction opposite to that of E.
The nucleus will be shifted in the direction of E by an amount which is proportional to E.

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Materials and Components
The residual resistivity of a binary alloy at 0 K is

Difference of residual resistivities of component metals
Product of residual resistivities of component metals
Sum of residual resistivities of component metals
Dependent on the concentration of minor component in the alloy

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