Unit 15 Week 1 Concept Quiz
An atom with an imbalance of electrons to protons is A an isotope. B a hadron. C a baryon. D an ion. E none of these
D an ion.
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.
D concentrated in the nucleus.
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
A N=A-Z
Which of the following is not a weakness of the Rutherford model of the atom? A The atom is mostly empty space. B The atom is unstable. C The atom cannot produce spectral lines. D The atom radiates energy continuously.
A The atom is mostly empty space.
Which statement about Rutherford's model of the atom is not correct? A The model explains spectral lines. B The model depicts electrons orbiting the nucleus as planets orbit the sun. C The model predicts that atoms are unstable. D The model states that positive charge is unevenly distributed.
A The model explains spectral lines.
The hydrogen nucleus consists of A a single proton. B one proton and two neutrons. C one proton and one neutron. D a single neutron.
A a single proton.
Rutherford's experiments involving the use of alpha particle beams directed onto thin metal foils demonstrated the existence of which of the following? A nucleus B neutron C proton D positron
A nucleus
The nucleus of an atom is made up of which of the following combinations of particles? A protons and neutrons B electrons and neutrons C electrons and protons D protons, electrons, and neutrons
A protons and neutrons
The atomic number of an element is the same as the number of its A protons. B neutrons. C nucleons. D none of these
A protons.
When nucleons join to form a stable nucleus, energy is A released. B absorbed. C not transferred. D destroyed.
A released.
If there are 121 neutrons in Au-200, how many neutrons are found in the nucleus of Au-197? A 122 B 118 C 123 D 130
B 118
A nucleon is either A a proton or an electron. B a proton or a neutron. C a positron or an electron. D a neutron or an electron.
B a proton or a neutron.
Which of the atomic particles has the least mass? A proton B electron C nucleon D neutron
B electron
In Rutherford's experiment, why did the nucleus repel alpha particles? A electrostatic attraction between the positively charged nucleus and alpha particles B electrostatic repulsion between the positively charged nucleus and alpha particles C electrostatic repulsion between the negatively charged nucleus and alpha particles D electrostatic attraction between the negatively charged nucleus and alpha particles
B 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? A positive charges B empty space C the nucleus D electrons
B empty space
An atom's mass number is determined by the number of A neutrons in its nucleus. B nucleons in its nucleus. C alpha particles in its nucleus. D protons in its nucleus.
B nucleons in its nucleus.
The atomic mass number of an element is the same as the number of its A neutrons. B nucleons. C protons. D none of these
B nucleons.
The atomic mass unit is defined as A the mass of a hydrogen-1 atom. B one twelfth the mass of a carbon-12 atom. C the mass of an electron. D the mass of a proton.
B one twelfth the mass of a carbon-12 atom.
An atom's atomic number is determined by the number of A nucleons in its nucleus. B protons in its nucleus. C neutrons in its nucleus. D alpha particles in its nucleus.
B protons in its nucleus.
Isotopes of an element have nuclei with A a different number of protons, and the same number of neutrons. B the same number of protons, but different numbers of neutrons. C a different number of protons, and a different number of neutrons. D the same number of protons, and the same number of neutrons.
B the same number of protons, but different
If there are 73 neutrons in the fictious element X-136, how many neutrons are found in the nucleus of X-173? A 122 B 123 C 110 D 130
C 110
Atoms with the same atomic number but with different numbers of neutrons are referred to as A nucleons. B none of the given answers C isotopes. D nuclides.
C isotopes.
Uranium-235, uranium-238 and uranium-239 are different A elements. B ions. C isotopes. D none of these
C isotopes.
The binding energy of a nucleus is contributed to A alpha decay. B radioactivity. C mass defect. D too many neutrons.
C mass defect.
Different isotopes of an element have different numbers of A photons. B hadrons. C neutrons. D protons. E none of these
C neutrons.
What is the concentration of positive charge and mass in Rutherford's atomic model called? A proton B alpha particle C nucleus D neutron
C nucleus
What does the mass number of a nucleus indicate? A the number of protons present B the average atomic mass of the element C the number of neutrons and protons present D the number of neutrons present
C the number of neutrons and protons present
The mass of an atomic nucleon is nearly A a thousand times the mass of an electron. B four times the mass of an electron. C two thousand times the mass of an electron. D twice the mass of an electron.
C two thousand times the mass of an electron.
The number of protons in an atom is A zero. B the same for all elements. C equal to the number of neutrons. D equal to the number of electrons.
D equal to the number of electrons.
Compared to the masses of its separate protons and neutrons, the total mass of a stable nucleus is always A the same. B zero. C greater. D less.
D less.
What is the binding energy of a nucleus? A the mass of the nucleus times c2 B the energy needed to remove one of the nucleons C the average energy with which any nucleon is bound in the nucleus D the energy released when nucleons bind together to form a stable nucleus
D the energy released when nucleons bind together to form a stable nucleus
To which of the following is the atomic number of a given element equivalent? A the number of electrons in the outer shells B the number of neutrons in the nucleus C the sum of the protons and neutrons in the nucleus D the number of protons in the nucleus
D the number of protons in the nucleus