Multiple Choice
What is the typical charge of sodium ions (Na) when present in a salt compound?
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2. Atoms & Elements
Ions
Multiple Choice
Which of the following elements is commonly used to dope silicon to create an n-type semiconductor?
A
Boron (B)
B
Aluminum (Al)
C
Magnesium (Mg)
D
Phosphorus (P)
Verified step by step guidance1
Understand that doping silicon to create an n-type semiconductor involves adding an element with more valence electrons than silicon, which has 4 valence electrons.
Recall that n-type semiconductors are created by adding pentavalent impurities (elements with 5 valence electrons) to silicon, which provide extra free electrons for conduction.
Identify the elements given: Boron (3 valence electrons), Aluminum (3 valence electrons), Magnesium (2 valence electrons), and Phosphorus (5 valence electrons).
Recognize that Phosphorus, having 5 valence electrons, donates an extra electron when substituted into the silicon lattice, thus creating an n-type semiconductor.
Conclude that among the options, Phosphorus (P) is the correct dopant for creating an n-type semiconductor by increasing the number of free electrons in silicon.
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