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