Band Theory (A) Give a brief description of the formation of electron bands in crystals including reference...

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Chemistry

Band Theory
(A) Give a brief description of the formationof electron bands in crystals including reference to the atomicstructure of the constituent atoms.
(B) Explain the following
i.Sodium, which has 2 atoms in a bcc(conventional cubic) unit cell, is a metal
ii.Calcium, which has 4 atoms in afcc (conventional cubic) unit cell, is a metal
iii.Diamond, which has 8 atoms in afcc (conventional cubic unit cell with a basis, is an electricalinsulator, whereas silicon and germanium, which have similarstructures, are semiconductors.
(C) Why is diamond transparent?

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3.6 Ratings (355 Votes)

A Electrons are restricted to certain sets of discrete energy levels within atoms with large gaps among them where no energy state is available for the electron to occupy In solids they are also restricted and only allowed to certain energies Instead of having such discrete energies the available energy states form bands This is very vital to the conduction process to make sure that electrons are present in the conduction band The discrete energy levels of the isolated atom See Answer

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