Which charge carrier has lower mobility for an intrinsic semiconductor?

Pure Si is known as an intrinsic semiconductor.  As the temperature of pure Si increases, what do you expect to happen to the conductivity?

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As we increase the temperature of extrinsic semiconductor Si we expect the conductivity to

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The bandgap of Germanium and Silicon are 0.67eV and 1.11eV, respectively.  How do you expect the conductivity of pure Ge to compare with that of pure Si at the same finite temperature?

Si has an atomic number of 14.  This means it has 4 electrons in its valence shell (the 3rd shell).  How many other Si atoms does each Si atom bond with to form solid Si?

Semiconductors exhibit resisitivities that fall between those of conductors and insulators.  Typical resistivity ranges for semiconductors are:

Dopants are added carefully to Si to make it an extrinsic semiconductor.  Which elements can be used as dopants for Si?