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The Solid State
Question
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Give reasons for the following:
All metals have metallic bonds but some metals are soft and having low melting points and some are hard and having high melting points.

Answer

The strength of metallic bond depends upon the numbr of valence electrons of the metal atom and the magnitude of forces binding these electrons to the nuclei. Thus the strength of metallic bond in different metals may be weak or strong, hence their nature (soft or hard) and their melting points may be different.

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Some More Questions From The Solid State Chapter

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show clevage property?

Classify the following solids in different categories based on the nature of intermolecular forces operating in them:
Potassium sulphate, tin, benzene, urea, ammonia, water, zinc
sulphate, graphite, rubidium, argon, silicon carbide.

Solid A is a very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

Ionic solids conduct electricity in liquid state but not in solid state. Explain.

What type of solids are electrical conductors, malleable and ductile?

Give the significance of a 'lattice point'.

Name the parameters that characterize a unit cell.

Distinguish between Hexagonal and monoclinic unit cells.

Distinguish between Face-centred and end-centred unit cells.