Exercises
Ø
The mass of an atom is
A) approximately equally divided between neutrons, protons, and electrons.
B) evenly divided between the nucleus and the surrounding electron cloud.
C) concentrated in the cloud of electrons surrounding the nucleus.
D) concentrated in the nucleus.
Ø
Which of the atomic particles has the least mass?
A) electron
B) proton
C) neutron
D) nucleon
Ø
The hydrogen nucleus consists of
A) a single proton.
B) a single neutron.
C) one proton and one neutron.
D) one proton and two neutrons.
Ø
An atom's atomic number is determined by the number of
A) neutrons in its nucleus.
B) nucleons in its nucleus.
C) protons in its nucleus.
D) alpha particles in its nucleus.
Ø
An atom's mass number is determined by the number of
A) neutrons in its nucleus.
B) nucleons in its nucleus.
C) protons in its nucleus.
D) alpha particles in its nucleus.
Ø
If an atom's atomic number is given by Z, its atomic mass by A, and
its neutron
number by N,
which of the following is correct?
A) N = A + Z
B) N = Z - A
C) N = A - Z
D) none of the given answers
Ø
When a neutron is emitted from an unstable nucleus, the atomic mass
number of the
nucleus
A) increases by 1.
B) decreases by 1.
C) does not change.
D) none of the given answers
Ø
The number of protons in an atom is
A) zero.
B) equal to the number of neutrons.
C) equal to the number of electrons.
D) the same for all elements.
Ø
There is a limit to the size of a stable nucleus because of
A) the limited range of the strong nuclear force.
B) the weakness of the electrostatic force.
C) the weakness of the gravitational force.
D) none of the given answers
Ø
Atoms with the same atomic number but with different numbers of
neutrons are
referred to
as
A) nucleons.
B) nuclides.
C) isotopes.
D) none of the given answers
Ø
Isotopes of an element have nuclei with
A) the same number of protons, but different numbers of neutrons.
B) the same number of protons, and the same number of neutrons.
C) a different number of protons, and a different number of neutrons.
D) a different number of protons, and the same number of neutrons.
Ø
The atomic mass unit is defined as
A) the mass of a proton.
B) the mass of an electron.
C) the mass of a hydrogen-1 atom.
D) one twelfth the mass of a carbon-12 atom.
Ø
Compared to the masses of its separate protons and neutrons, the
total mass of a
stable
nucleus is always
A) less.
B) the same.
C) greater.
D) zero.
Ø
When nucleons join to form a stable nucleus, energy is
A) destroyed.
B) absorbed.
C) released.
D) not transferred.
Ø
The binding energy of a nucleus is contributed to
A) radioactivity.
B) alpha decay.
C) too many neutrons.
D) mass defect.
Ø
The binding energy per nucleon is
A) directly proportional to atomic number.
B) inversely proportional to atomic number.
C) the same for all atoms.
D) none of the given answers
Ø
The binding energy per nucleon
A) increases steadily as we go to heavier elements.
B) decreases steadily as we go to heavier elements.
C) is approximately constant throughout the periodic table, except for very
light nuclei.
D) has a maximum near iron in the periodic table.
Ø
Which of the following statements concerning the nuclear force is
false?
A) The nuclear force is very short-ranged.
B) The nuclear force is very weak and much smaller in relative magnitude
than the electrostatic and gravitational forces.
C) The nuclear force is attractive and not repulsive.
D) The nuclear force acts on both protons and neutrons.
Ø
Compared to the electrostatic force, the nuclear force between
adjacent protons in a
nucleus is
A) much weaker.
B) about the same size.
C) only slightly larger.
D) much larger.
Ø
Alpha rays can penetrate
A) air only.
B) a piece of paper.
C) several millimeters of aluminum.
D) several centimeters of lead.
Ø
Beta rays can penetrate
A) air only.
B) a piece of paper.
C) several millimeters of aluminum.
D) several centimeters of lead.
Ø
Gamma rays can penetrate
A) air only.
B) a piece of paper.
C) several millimeters of aluminum.
D) several centimeters of lead.
Ø
An α particle is also known as
A) an electron.
B) a positron.
C) a helium nucleus.
D) a photon.
Ø
A β- particle is
also known as
A) an electron.
B) a positron.
C) a helium nucleus.
D) a photon.
Ø
A β+ particle is also known as
A) an electron.
B) a positron.
C) a helium nucleus.
D) a photon.
Ø
A gamma ray is also known as
A) an electron.
B) a positron.
C) a helium nucleus.
D) a photon.
Ø
An alpha particle will be attracted to a
A) gamma ray.
B) proton.
C) positive charge.
D) negative charge.
Ø
Alpha particles have an atomic mass equal to
A) 1.
B) 2.
C) 4.
D) 6.
Ø
When an alpha particle is emitted from an unstable nucleus, the
atomic mass
number of the
nucleus
A) increases by 2.
B) decreases by 2.
C) increases by 4.
D) decreases by 4.
Ø
When an alpha particle is emitted from an unstable nucleus, the
atomic number of
the nucleus
A) increases by 2.
B) decreases by 2.
C) increases by 4.
D) decreases by 4.
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Page |
Problem |
Category |
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860 |
2 |
Nuclear Properties |
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860 |
112 |
Binding Energy |
|
861 |
36 |
Half-Life and Decay Rates |