The Structure of the Atom

What is the charge on an electron?

• –1

• 0

• +1

• +2

A lithium atom has three protons, three neutrons, and three electrons. What is the overall charge on this atom?

• –3

• 0

• +1

• +3

Which two particles are found in the nucleus of an atom?

• neutrons and electrons

• protons and electrons

• protons and neutrons

• neutrons and atoms

A scientist uses an accelerator and high energy electrons to study the particles inside the protons of a helium atom. What particles is the scientist studying?

• the He neutrons

• the He nucleus

• the He electrons

• the He quarks

In which of these statements are protons, electrons, and neutrons correctly compared?

• Quarks are present in protons and neutrons but not in electrons.

• Quarks are present in protons, neutrons, and electrons.

• Quarks are present in neutrons and electrons but not in protons.

• Quarks are present in protons and electrons but not in neutrons.

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?

• They both have seven protons in the nucleus.

• They both have the same mass number.

• They both have seven neutrons in the nucleus.

• They both have the same atomic number.

The mass number of Fe2+ is 56. How many neutrons are there in a single Fe2+ atom?

• 28

• 30

• 56

• 58

An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?

• the neutron and the electron

• the proton and the electron

• the proton and the neutron

• the neutron and the atom

Which statement describes an electron?

• It has a positive charge and is located in the nucleus.

• It has a positive charge and is located in orbitals around the nucleus.

• It has a negative charge and is located in the nucleus.

• It has a negative charge and is located in orbitals around the nucleus.

A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?

• –3

• –2

• 0

• +3