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A pentavalent impurity in silicon is called a donor because it:
AGives one extra electron for conduction
BAccepts an electron from the lattice
CRemoves one covalent bond from Si
DCreates an extra hole in a bond
Answer & Solution
Correct answer: A. Gives one extra electron for conduction
Four of its five valence electrons bond with Si, and the fifth is donated as a free conduction electron.
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