U15W1
If there are 73 neutrons in the fictious element X-136, how many neutrons are found in the nucleus of X-173?
110
If there are 121 neutrons in Au-200, how many neutrons are found in the nucleus of Au-197?
118
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?
N=A-Z
Which of the following is not a weakness of the Rutherford model of the atom?
The atom is mostly empty space.
Which statement about Rutherford's model of the atom is not correct?
The model explains spectral lines.
A nucleon is either
a proton or a neutron.
The hydrogen nucleus consists of
a single proton.
An atom with an imbalance of electrons to protons is
an ion.
The mass of an atom is
concentrated in the nucleus.
Which of the atomic particles has the least mass?
electron
In Rutherford's experiment, why did the nucleus repel alpha particles?
electrostatic repulsion between the positively charged nucleus and alpha particles
According to the Rutherford model, what makes up most of the volume of an atom?
empty space
The number of protons in an atom is
equal to the number of electrons.
Atoms with the same atomic number but with different numbers of neutrons are referred to as
isotopes.
Uranium-235, uranium-238 and uranium-239 are different
isotopes.
Compared to the masses of its separate protons and neutrons, the total mass of a stable nucleus is always
less.
The binding energy of a nucleus is contributed to
mass defect.
Different isotopes of an element have different numbers of
neutrons.
An atom's mass number is determined by the number of
nucleons in its nucleus.
The atomic mass number of an element is the same as the number of its
nucleons.
Rutherford's experiments involving the use of alpha particle beams directed onto thin metal foils demonstrated the existence of which of the following?
nucleus
What is the concentration of positive charge and mass in Rutherford's atomic model called?
nucleus
The atomic mass unit is defined as
one twelfth the mass of a carbon-12 atom.
The nucleus of an atom is made up of which of the following combinations of particles?
protons and neutrons
An atom's atomic number is determined by the number of
protons in its nucleus.
The atomic number of an element is the same as the number of its
protons.
When nucleons join to form a stable nucleus, energy is
released.
What is the binding energy of a nucleus?
the energy released when nucleons bind together to form a stable nucleus
What does the mass number of a nucleus indicate?
the number of neutrons and protons present
To which of the following is the atomic number of a given element equivalent?
the number of protons in the nucleus
Isotopes of an element have nuclei with
the same number of protons, but different numbers of neutrons
The mass of an atomic nucleon is nearly
two thousand times the mass of an electron.
