N-type semiconductors are those conductors that have a pentavalent impurity and have 5 electrons in their valence shell.  

Explanation:

• Semiconductors are those which have the property of both conductor and insulator.
• N-type semiconductors are those conductors that are impure and have 5 electrons in their valence shell.  
• It also contains the dopant elements or pentavalent impurity that are added to increase the induction ability of N-type semiconductor.
• The conductivity of the N-type semiconductor is higher than the pure semiconductor because it has more number of dopant elements.

Explanation:

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