Multiple Choice
Which of the following is the number of protons in an atom of the element with atomic number 13?
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2. Atoms & Elements
The Atom
Multiple Choice
Which of the following is the major impurity added to silicon to create n-type semiconductors?
A
Phosphorus
B
Carbon
C
Aluminum
D
Boron
Verified step by step guidance1
Understand that n-type semiconductors are created by doping silicon with an element that has more valence electrons than silicon. Silicon has 4 valence electrons.
Identify that n-type doping involves adding an element with 5 valence electrons, which will donate extra electrons to the silicon lattice, increasing its conductivity.
Review the options: Carbon (4 valence electrons), Aluminum (3 valence electrons), Boron (3 valence electrons), and Phosphorus (5 valence electrons).
Recognize that Phosphorus, having 5 valence electrons, is the impurity that donates extra electrons, making it the major impurity used to create n-type semiconductors.
Conclude that the correct choice is Phosphorus because it introduces free electrons into the silicon crystal, enhancing its electrical conductivity as an n-type semiconductor.
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