Atomic Structure Exam-Imaging I 2526

Why is a working knowledge of the atom important in radiologic sciences?

• It helps in understanding interactions that occur at the atomic level in various processes.

• It is only needed for chemistry classes.

• It is not relevant to radiologic sciences.

• It is only important for understanding biology.

Which of the following best describes John Dalton's contribution to atomic theory?

• He developed a sound atomic theory based on scientific evidence.

• He discovered the electron.

• He created the first model of the atom with a nucleus.

• He proposed the law of conservation of mass.

Which of the following best describes the reasoning behind the name "plum pudding model"?

• The atom is shaped like a pudding with plums representing protons

• The atom is a sphere of positive charge with electrons embedded like plums in a pudding

• The atom is a solid sphere with no internal structure

• The atom is a mixture of neutrons and protons only

Who conducted experiments with alpha particles that led to a new model of the atom?

• Niels Bohr

• J.J. Thomson

• Ernest Rutherford

• John Dalton

Which earlier atomic model was replaced by Rutherford's nuclear model?

• Bohr model

• Quantum model

• Plum pudding model

• Solid sphere model

Why is the quantity of electrons, neutrons, and protons important in an atom?

• It determines the unique identity of the matter or element.

• It affects the color of the atom.

• It changes the temperature of the atom.

• It makes the atom heavier.

What particles make up the nucleus of an atom?

• Protons and neutrons

• Electrons and protons

• Neutrons and electrons

• Only protons

Which of the following best describes the concept of "shell" in atomic structure?

• The shell is the nucleus of the atom

• The shell is a defined energy level where electrons are found

• The shell is made up of protons and neutrons

• The shell is the space between atoms

Which of the following correctly matches the electrical charge and mass of an electron?

• Positive, 1.673 × 10⁻²⁷ kg

• Neutral, 1.675 × 10⁻²⁷ kg

• Negative, 9.109 × 10⁻³¹ kg

• Positive, 9.109 × 10⁻³¹ kg

If the negative charges in an atom outnumber the positive charges, what is the atom called?

• Positive ion

• Negative ion

• Neutral atom

• Isotope