allerySilicon and germanium are described as elements that are:
ATetravalent
BTrivalent
CPentavalent
DUnivalent
Answer & Solution
Correct answer: A. Tetravalent
1. Doping uses trivalent or pentavalent atoms in these crystals.
2. The host atoms themselves have four valence electrons.
3. So silicon and germanium are tetravalent.
_Source: syllabus Physics Part II, Chapter 14, Semiconductor Electronics._
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