1. What is the electron density at a nodal surface?
A.
Maximum
B.
Minimum but not zero
C.
Zero
D.
Equal to the nuclear density
Correct Answer:
Zero
2. A node in an orbital is a region where:
A.
Electron density is zero
B.
Electron density is maximum everywhere
C.
The nucleus is present
D.
The electron has maximum speed
Correct Answer:
Electron density is zero
3. The electron density of a 1s orbital is greatest:
A.
Near the nucleus
B.
Only far away from the nucleus
C.
At a nodal plane
D.
At the outer boundary only
Correct Answer:
Near the nucleus
4. The electron density of a 1s orbital generally decreases as the distance from the nucleus:
A.
Decreases
B.
Increases
C.
Becomes zero immediately
D.
Remains exactly constant
Correct Answer:
Increases
5. What is the shape of the electron-density distribution of a 1s orbital?
A.
Spherical
B.
Dumbbell-shaped
C.
Linear
D.
Planar triangular
Correct Answer:
Spherical
6. Which orbital has a dumbbell-shaped electron-density distribution?
A.
1s
B.
2s
C.
2p
D.
3s
Correct Answer:
2p
7. A p orbital has a nodal plane passing through the nucleus. What is the electron density on this plane?
A.
Zero
B.
Maximum
C.
Constant and nonzero
D.
Equal to the density at the two lobes
Correct Answer:
Zero
8. The two lobes of a p orbital are regions of:
A.
Significant electron density separated by a nodal plane
B.
Zero electron density throughout
C.
Nuclear matter
D.
Circular electron paths
Correct Answer:
Significant electron density separated by a nodal plane
9. Which statement about the sign of the wave function is correct in relation to electron density?
A.
Changing the sign of the wave function does not change electron density
B.
Changing the sign makes electron density negative
C.
Electron density is equal to the sign of the wave function
D.
Changing the sign removes the orbital
Correct Answer:
Changing the sign of the wave function does not change electron density
10. Can electron density have a negative value?
A.
Yes, in every orbital
B.
Yes, only in p orbitals
C.
No, because it is proportional to the square of the wave function
D.
No, because electrons have no charge
Correct Answer:
No, because it is proportional to the square of the wave function
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