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A pentavalent dopant donates one extra electron and is therefore known as a:

ADonor impurity
BDoubled impurity
CDivided impurity
DDirected impurity
Answer & Solution
Correct answer: A. Donor impurity
1. The fifth valence electron has no bond to occupy. 2. It is released into the crystal for conduction. 3. The pentavalent dopant is donating one extra electron and hence is known as donor impurity. 4. So the answer is donor impurity. _Source: syllabus Physics Part II, Ch 14 'Semiconductor Electronics'_
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