1. The electron density of a p orbital is commonly represented as:
A.
A sphere
B.
A dumbbell
C.
A cube
D.
A ring only
Correct Answer:
A dumbbell
2. In a p orbital, the plane passing through the nucleus between its two lobes is a region of:
A.
Maximum electron density
B.
Zero electron density
C.
Constant nuclear density
D.
Infinite electron density
Correct Answer:
Zero electron density
3. The two lobes of a p orbital are regions where electron density is generally:
A.
Present on both sides of the nucleus
B.
Absent everywhere
C.
Present only inside the nucleus
D.
Present only at the nodal plane
Correct Answer:
Present on both sides of the nucleus
4. Which quantity is represented by the density of dots in an electron-cloud model?
A.
The probability of finding the electron
B.
The number of protons in the nucleus
C.
The atomic mass
D.
The electron's exact speed
Correct Answer:
The probability of finding the electron
5. A high electron-density region means that the electron is:
A.
More likely to be found there
B.
Definitely fixed there
C.
Moving in a circular path there
D.
Converted into a proton there
Correct Answer:
More likely to be found there
6. Which statement about the position of an electron in an orbital is correct?
A.
Its exact position is always known
B.
Only the probability of finding it in a region can be described
C.
It always stays at the nucleus
D.
It always stays at the outer boundary of the orbital
Correct Answer:
Only the probability of finding it in a region can be described
7. If a region of an orbital is shown with more dots, it usually has:
A.
Lower electron density
B.
Higher electron density
C.
No electron density
D.
Only nuclear particles
Correct Answer:
Higher electron density
8. Which orbital has electron density distributed equally in all directions around the nucleus?
A.
s orbital
B.
p orbital
C.
d orbital only
D.
Any orbital with a node
Correct Answer:
s orbital
9. The shape of an orbital is determined by the distribution of:
A.
Electron density
B.
Nuclear mass
C.
Neutron density only
D.
Atomic weight
Correct Answer:
Electron density
10. Which statement about an orbital boundary is correct?
A.
It is a sharp physical wall for the electron
B.
It encloses a region of high probability of finding the electron
C.
It is the surface of the nucleus
D.
It marks the exact path of the electron
Correct Answer:
It encloses a region of high probability of finding the electron
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