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Q.
If a pentavalent impurity is mixed in the crystal-lattice of germanium then the semiconductor formed will be
Chhattisgarh PMTChhattisgarh PMT 2007
Solution:
Pentavalent elements have one excess valence electron after forming the four covalent bond normally formed by germanium. The excess electrons give rise to electrical conductance. It is called n-type semi-conductors, the symbol '$n$' indicates that the negative charge flows in them.