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.