The Solid State

Short Answer Type

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Although pure silicon is an insulator, then how does it behave as a semiconductor on heating.

On heating some covalent bonds among silicon atoms break on heating and electrons become free to move under applied field, hence silicon behaves like semi-conductor at high temperature.
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    What is meant by octahedral void in a close-packed structure?
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    What is the two-dimentional coordination number of a molecule in square closed packed layer ?

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    What is the general structure of ionic solids?
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