An n-type and p-type semiconductor can be obtained by respectively doping pure silicon with

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Pure silicon is a Group 14 element. An n-type semiconductor is obtained by doping pure silicon with a pentavalent impurity (Group 15 element) such as Phosphorous, Arsenic, Antimony, or Bismuth. A p-type semiconductor is obtained by doping pure silicon with a trivalent impurity (Group 13 element) such as Boron, Aluminium, Gallium, or Indium. Thus, doping with Phosphorous gives an n-type semiconductor and doping with Indium gives a p-type semiconductor. Answer: Phosphorous and Indium respectively