Which is NOT a characteristic of a semiconductor?

Question

Answer

A semiconductor is made by doping silicon, so that some of the 
 
atoms in the crystal have either one extra electron, or one fewer electron

Answer

Most electrons are tightly bound to atoms and not available as charge 
 
carriers for electric current

Answer

A pure silicon crystal is a semiconductor

Answer

Some electrons are weakly bound to atoms, and can move through the 
 
substance in the presence of an electric field

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