1. What does electron density in an orbital represent?
A.
The mass of the electron
B.
The probability of finding an electron in a region
C.
The speed of the electron
D.
The size of the nucleus
Correct Answer:
The probability of finding an electron in a region
2. In an electron-density diagram, a darker or denser region usually indicates:
A.
A higher probability of finding the electron
B.
A higher nuclear charge
C.
A larger electron mass
D.
A lower energy of the nucleus
Correct Answer:
A higher probability of finding the electron
3. Electron density is commonly related to the square of which quantity?
A.
Atomic number
B.
Wave function
C.
Mass number
D.
Nuclear radius
Correct Answer:
Wave function
4. Which statement about electron density is correct?
A.
It is the same everywhere in an orbital
B.
It shows the likely distribution of an electron
C.
It gives the exact path of an electron
D.
It gives the mass of an electron at each point
Correct Answer:
It shows the likely distribution of an electron
5. The electron density of a 1s orbital is distributed in which general shape?
A.
Spherical
B.
Dumbbell-shaped
C.
Tetrahedral
D.
Linear
Correct Answer:
Spherical
6. For a 1s orbital, electron density generally decreases as the distance from the nucleus:
A.
Decreases
B.
Increases
C.
Becomes zero immediately
D.
Remains unchanged
Correct Answer:
Increases
7. An orbital is best described as a region where there is a high probability of finding:
A.
A neutron
B.
An electron
C.
A proton
D.
A nucleus only
Correct Answer:
An electron
8. Which statement correctly describes an electron cloud?
A.
It is the fixed circular path of an electron
B.
It represents regions of different electron density
C.
It is made only of protons
D.
It shows the exact position of an electron
Correct Answer:
It represents regions of different electron density
9. A region of zero electron density in an orbital is called a:
A.
Nucleus
B.
Node
C.
Shell
D.
Cation
Correct Answer:
Node
10. At a node, the probability of finding an electron is:
A.
Maximum
B.
Zero
C.
Always one
D.
Equal to the nuclear charge
Correct Answer:
Zero
Short questions are currently unavailable for this page.