1. According to the modern concept of an atom, an electron is described as occupying:
A.
A definite orbit only
B.
A region called an orbital
C.
The nucleus permanently
D.
A fixed point outside the atom
Correct Answer:
A region called an orbital
Explanation:
In the modern atomic model, an electron is associated with an orbital, which is a region of high probability around the nucleus.
2. What does an orbital mainly describe?
A.
The probable location of an electron
B.
The exact speed of a proton
C.
The composition of the nucleus
D.
The total mass of an atom
Correct Answer:
The probable location of an electron
Explanation:
An orbital describes where an electron is likely to be found rather than specifying its exact location.
3. Which phrase is most closely associated with the definition of an orbital?
A.
Exact electron path
B.
High-probability region for an electron
C.
Central nuclear particle
D.
Energy released by an atom
Correct Answer:
High-probability region for an electron
Explanation:
The defining feature of an orbital is that it is a region where the probability of finding an electron is high.
4. An atomic orbital is best represented as:
A.
A three-dimensional probability region
B.
A two-dimensional circular track
C.
A solid particle in the nucleus
D.
A line showing electron motion
Correct Answer:
A three-dimensional probability region
Explanation:
An orbital is a three-dimensional region around the nucleus that represents the probable location of an electron.
5. Why is an orbital not called a definite path?
A.
Because electrons are found only inside the nucleus
B.
Because an orbital gives a region of probability rather than an exact route
C.
Because orbitals contain protons instead of electrons
D.
Because an orbital is smaller than the nucleus
Correct Answer:
Because an orbital gives a region of probability rather than an exact route
Explanation:
An orbital represents the probability distribution of an electron and therefore does not specify a definite path.
6. What is an atomic orbital?
A.
A circular path followed by an electron
B.
A region around the nucleus where the probability of finding an electron is high
C.
The exact position of an electron in an atom
D.
The total energy of an atom
Correct Answer:
A region around the nucleus where the probability of finding an electron is high
7. An orbital represents the probable location of which particle?
A.
Proton
B.
Neutron
C.
Electron
D.
Nucleus
Correct Answer:
Electron
8. Which statement correctly defines an orbital?
A.
It is the fixed path of an electron around the nucleus
B.
It is a region of space with a high probability of finding an electron
C.
It is the central part of an atom containing electrons
D.
It is the complete atom excluding the nucleus
Correct Answer:
It is a region of space with a high probability of finding an electron
9. Which term is associated with the probability distribution of an electron in an atom?
A.
Orbital
B.
Nucleus
C.
Proton number
D.
Mass number
Correct Answer:
Orbital
10. An orbital does not describe the:
A.
Likely region of an electron
B.
Probability of finding an electron
C.
Exact path of an electron
D.
Spatial distribution of an electron
Correct Answer:
Exact path of an electron
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