Q9 of 68 Page 30

Explain

The basis of similarities and differences between metallic and ionic crystals.











Basic similarities



Constituent particles are held together with electrostatic force of attraction.


High melting points.



Basic difference

















Metallic crystals



Ionic crystals



Electrons are free to move.



Ions are not free to move.



Good conductor of electricity.



Not good conductor of electricity.





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8

How many lattice points are there in one unit cell of each of the following lattice?

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How many lattice points are there in one unit cell of each of the following lattice?

Body-centred

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Explain

Ionic solids are hard and brittle.

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Calculate the efficiency of packing in case of a metal crystal for

simple cubic