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Give two examples of trivalent and pentavalent impurities.

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Trivalent Impurities:  1) Gallium (Ga) 2) Indium (In) 3) Aluminium (Al) 4) Boron (B) 

Pentavalent Impurities:  1) Phosphorus (P) 2) Antimony (Sb) 3) Arsenic (As) 4) Bismuth (Bi)

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