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(B) Silicon $(Si)$ is a group-$14$ element with $4$ valence electrons.Arsenic $(As)$ is a group-$15$ element with $5$ valence electrons.When arsenic i

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$n$-type semiconductor

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(B) Silicon $(Si)$ is a group-$14$ element with $4$ valence electrons.Arsenic $(As)$ is a group-$15$ element with $5$ valence electrons.When arsenic is added to silicon as an impurity (doping),$4$ of its valence electrons form covalent bonds with the surrounding silicon atoms.The $5$th valence electron remains free to move,acting as a charge carrier.Since the majority charge carriers are electrons (negative charge),the resulting material is an $n$-type semiconductor.

When arsenic is added as an impurity to silicon,the resulting material is

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