1. Which of the following best defines an orbital in modern atomic theory?
A.
A fixed circular path of an electron
B.
A three-dimensional region with a high probability of finding an electron
C.
A layer made only of protons
D.
A straight line between two nuclei
Correct Answer:
A three-dimensional region with a high probability of finding an electron
2. An orbital is associated with the motion of an electron in an atom in terms of:
A.
Exact circular motion
B.
Probability
C.
Nuclear mass
D.
Proton count
Correct Answer:
Probability
3. Which statement about the electron in an orbital is correct?
A.
Its exact path is known
B.
Its probable location is described
C.
It remains fixed at one point
D.
It is present inside the nucleus
Correct Answer:
Its probable location is described
4. An orbital may be visualized as an electron:
A.
Probability cloud
B.
Solid ring
C.
Nuclear particle
D.
Straight track
Correct Answer:
Probability cloud
5. Which phrase is most closely related to the definition of an orbital?
A.
Most probable region for an electron
B.
Fixed path of a proton
C.
Mass of an atom
D.
Number of neutrons
Correct Answer:
Most probable region for an electron
6. An orbital is not a:
A.
Region of electron probability
B.
Three-dimensional space around the nucleus
C.
Definite circular path
D.
Description of probable electron location
Correct Answer:
Definite circular path
7. The presence of an electron in an orbital is expressed in terms of:
A.
Probability
B.
Exact certainty at every point
C.
Nuclear temperature
D.
Proton movement
Correct Answer:
Probability
8. Which of the following can be associated with an atomic orbital?
A.
A region around the nucleus
B.
A path inside the nucleus
C.
A collection of neutrons
D.
A fixed position of the proton
Correct Answer:
A region around the nucleus
9. An orbital gives information about where an electron is likely to be found, not its:
A.
Probability
B.
Region
C.
Exact path
D.
Presence around the nucleus
Correct Answer:
Exact path
10. Which statement is true about an orbital?
A.
It is a region in space associated with a particular electron
B.
It is the path followed by the nucleus
C.
It is a particle present in the atom
D.
It is the same as the atomic nucleus
Correct Answer:
It is a region in space associated with a particular electron
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