1. A darker region in an electron-density diagram usually represents what?
A.
Higher electron density
B.
Lower nuclear charge
C.
Higher electron mass
D.
Zero electron probability
Correct Answer:
Higher electron density
2. What does a lighter region in an electron-density diagram generally indicate?
A.
Lower electron density
B.
Greater electron mass
C.
Greater nuclear charge
D.
An exact electron path
Correct Answer:
Lower electron density
3. Why is electron density used to describe an electron in an orbital?
A.
The exact position of an electron cannot be specified, but its probability distribution can be described
B.
The electron always remains fixed at one point
C.
The electron has no charge
D.
The nucleus has no effect on the orbital
Correct Answer:
The exact position of an electron cannot be specified, but its probability distribution can be described
4. If region X has greater electron density than region Y, what can be concluded?
A.
The electron is more likely to be found in region X
B.
The electron is always present in region X
C.
Region X contains the nucleus
D.
The electron has greater mass in region X
Correct Answer:
The electron is more likely to be found in region X
5. What does electron density not represent?
A.
The exact path followed by an electron
B.
The probability of finding an electron in a region
C.
The distribution of electron probability
D.
The variation of probability within an orbital
Correct Answer:
The exact path followed by an electron
6. At a point where the wave function has a large magnitude, the electron density is generally what?
A.
Large
B.
Zero
C.
Negative
D.
Independent of the wave function
Correct Answer:
Large
7. Which phrase best describes a high-density portion of an orbital?
A.
A region where the electron is most likely to be found
B.
A region where the electron cannot be found
C.
A region containing only protons
D.
A region representing the electron's fixed orbit
Correct Answer:
A region where the electron is most likely to be found
8. What is the electron probability at a region with zero electron density?
A.
Zero
B.
One hundred percent
C.
Maximum but uncertain
D.
Equal to the atomic number
Correct Answer:
Zero
9. Which expression represents electron density in an orbital?
A.
|ψ|²
B.
ψ + 1
C.
ψ − 1
D.
1/ψ² only
Correct Answer:
|ψ|²
10. A probability cloud is usually a visual representation of what?
A.
The distribution of electron density around the nucleus
B.
The exact motion path of the nucleus
C.
The size of the electron itself
D.
The number of neutrons in the atom
Correct Answer:
The distribution of electron density around the nucleus
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