The valence of the impurity atom that is to b | vedclass

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(B) To create an $N$-type semiconductor,we need to add a pentavalent impurity (an element with $5$ valence electrons) to an intrinsic semiconductor li

Vedclass · Accepted Answer

$5$

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(B) To create an $N$-type semiconductor,we need to add a pentavalent impurity (an element with $5$ valence electrons) to an intrinsic semiconductor like germanium $(Ge)$.When a pentavalent atom (such as phosphorus,arsenic,or antimony) is added,$4$ of its valence electrons form covalent bonds with the neighboring germanium atoms,while the $5$th electron remains free to conduct electricity.Therefore,the valence of the impurity atom must be $5$.

The valence of the impurity atom that is to be added to a germanium crystal to make it an $N$-type semiconductor is:

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