Doping silicon or germanium with a pentavalent element produces which semiconductor?

1. A pentavalent atom has one more valence electron than silicon. 2. That spare electron is free to conduct. 3. Doping Si or Ge with a pentavalent element gives an n-type semiconductor. 4. So the answer is n-type. _Source: syllabus Physics Part II, Ch 14 'Semiconductor Electronics'_