1. Which phrase best completes the statement: An orbital is a region in space where the probability of finding an electron is...
A.
Zero everywhere
B.
Very high
C.
Exactly one
D.
Always changing to zero
Correct Answer:
Very high
2. What does an orbital show about an electron?
A.
Its exact circular motion
B.
Its probable location around the nucleus
C.
Its number of protons
D.
Its mass inside the nucleus
Correct Answer:
Its probable location around the nucleus
3. Which of the following is a correct feature of an orbital?
A.
It is a probability region
B.
It is a solid shell containing the electron
C.
It is the nucleus of the atom
D.
It is an exact electron track
Correct Answer:
It is a probability region
4. The concept of an orbital is based on the probability of finding an:
A.
Electron
B.
Atom's nucleus
C.
Isotope
D.
Element
Correct Answer:
Electron
5. Which statement about an orbital is incorrect?
A.
It is a region around the nucleus
B.
It gives the probable location of an electron
C.
It is a definite path followed by an electron
D.
It is related to electron probability
Correct Answer:
It is a definite path followed by an electron
6. An orbital is best described as a three-dimensional region around the:
A.
Electron
B.
Nucleus
C.
Neutron
D.
Proton
Correct Answer:
Nucleus
7. What is the main purpose of defining an orbital?
A.
To show the exact speed of an electron
B.
To show the probable region occupied by an electron
C.
To count the neutrons in an atom
D.
To determine the atomic mass directly
Correct Answer:
To show the probable region occupied by an electron
8. Which one is not a characteristic of an orbital?
A.
It represents electron probability
B.
It is a region of space
C.
It gives an exact electron path
D.
It is located around the nucleus
Correct Answer:
It gives an exact electron path
9. The word orbital refers to the region where an electron is:
A.
Certain to be at one fixed point
B.
Most likely to be found
C.
Located inside the nucleus
D.
Converted into a proton
Correct Answer:
Most likely to be found
10. Which of the following describes an orbital rather than an orbit?
A.
A fixed circular path
B.
A region of high electron probability
C.
A path with a definite radius
D.
A route followed by a proton
Correct Answer:
A region of high electron probability
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