An intrinsic semiconductor has
1. a large number of impurities
2. an excess of electrons
3. an excess of holes
4. none of the above
5. all of the above
A trivalent atom is also called
1. a metal
2. a semiconductor
3. a donor
4. an acceptor
5. None of the above
The valence electron of a copper atom experiences what kind of attraction toward the
nucleus?
1. Strong
2. Weak
3. None
4. impossible to say
5. All of the above
What is the maximum number of electrons that can exist in the shell closest to the
nucleus of an atom?
1. 1
2. 2
3. 4
4. 8
5. 3
1)
1. a large number of impurities
2)
4. an acceptor
3) weak
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