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Arsenic, antimony and phosphorus have valency 5, so they are:
AMonovalent
BPentavalent
CTrivalent
DTetravalent
Answer & Solution
Correct answer: B. Pentavalent
1. Penta means five.
2. These atoms have five valence electrons.
3. They are pentavalent dopants.
_Source: NCERT Class 12 Physics Part II, Chapter 14, Semiconductor Electronics._
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