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Materials and Components - Engineering

Q1:

Which of the following are donor impurities?
  1. Gold
  2. Phosphorus
  3. Boron
  4. Antimony
  5. Arsenic
  6. Induim
Select the correct answer using the following codes

A 1, 2, 3

B 1, 2, 4, 6

C 3, 4, 5, 6

D 2, 4, 5

ANS:D - 2, 4, 5

Donor impurities have five valence electrons.