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State the impurities for obtaining p-type and n-type semiconductor from intrinsic semi conductor. 
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Crystals of Silicon and Germanium are doped using two types of dopants: 

1. The impurities for obtaining n-type semiconductor from intrinsic semiconductor are pentavalent impurity; like Arsenic (As), Antimony (Sb), Phosphorous (P), etc. 

2. The impurities for obtaining p-type semiconductor from intrinsic semiconductor are trivalent impurity; like Indium (In), Boron (B), Aluminum (Al), etc.
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