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Which states get filled in the conduction band when the donor-type impurity is added to a crystal?

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Which states get filled in the conduction band when the donor-type impurity is added to a crystal?

(a) Na

(b) Nd

(c) N

(d) P

The question was posed to me in an interview.

The query is from Fermi Level in a Semiconductor having Impurities topic in division Conduction in Semiconductors of Electronic Devices & Circuits

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Right answer is (b) Nd

The explanation is: When the donor-type impurity is added to a crystal, first Nd states get filled because it is of the highest energy.

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