The impurity atom added to germanium to make | vedclass

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(A) To create an $N-$type semiconductor,a pentavalent impurity (an element from Group $15$ of the periodic table) must be added to an intrinsic semico

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Arsenic

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(A) To create an $N-$type semiconductor,a pentavalent impurity (an element from Group $15$ of the periodic table) must be added to an intrinsic semiconductor like Germanium $(Ge)$.Arsenic $(As)$ is a pentavalent element,meaning it has $5$ valence electrons.When Arsenic is doped into Germanium,$4$ of its valence electrons form covalent bonds with the surrounding Germanium atoms,and the $5$th electron becomes a free charge carrier,contributing to the $N-$type conductivity.Therefore,Arsenic is the correct impurity.

The impurity atom added to germanium to make it $N-$type semiconductor is

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