1. Electron density at a particular point is related to the likelihood of finding an electron:
A.
At that point or nearby region
B.
Only inside the nucleus
C.
At every point equally
D.
Only outside the atom
Correct Answer:
At that point or nearby region
2. Which statement distinguishes an orbital from an electron path?
A.
An orbital shows a probability distribution, not a fixed path
B.
An orbital is always a circular path
C.
An orbital contains only the nucleus
D.
An orbital shows the exact motion of an electron
Correct Answer:
An orbital shows a probability distribution, not a fixed path
3. Where is the electron density zero in a nodal region?
A.
The probability of finding the electron is zero
B.
The electron has maximum speed
C.
The nucleus is absent from the atom
D.
The electron has maximum mass
Correct Answer:
The probability of finding the electron is zero
4. Which feature of an orbital is represented by its shaded or cloud-like appearance?
A.
The distribution of electron density
B.
The number of neutrons
C.
The exact electron trajectory
D.
The temperature of the atom
Correct Answer:
The distribution of electron density
5. In a probability-density diagram, the region with the greatest concentration of points represents:
A.
The most probable region for finding the electron
B.
The region with no electron
C.
The location of all protons
D.
The outer boundary of the nucleus
Correct Answer:
The most probable region for finding the electron
6. What does electron density at a point in an orbital represent?
A.
The probability of finding an electron near that point
B.
The mass of the electron at that point
C.
The speed of the electron at that point
D.
The charge of the nucleus at that point
Correct Answer:
The probability of finding an electron near that point
7. Electron density at a point is proportional to which quantity?
A.
The wave function
B.
The square of the wave function
C.
The atomic mass
D.
The nuclear charge only
Correct Answer:
The square of the wave function
8. Which expression represents electron density mathematically?
A.
ψ
B.
ψ²
C.
1/ψ
D.
ψ + 1
Correct Answer:
ψ²
9. A region of high electron density in an orbital indicates that the electron is:
A.
More likely to be found there
B.
Moving fastest there
C.
Heaviest there
D.
Absent there
Correct Answer:
More likely to be found there
10. Which statement about an orbital is correct?
A.
It is a region where the probability of finding an electron is high
B.
It is a fixed circular path of an electron
C.
It is the nucleus of an atom
D.
It is a region having no electron density
Correct Answer:
It is a region where the probability of finding an electron is high
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