Name:______Date:______

Atomic Structure Unit Test – Part One

Multiple Choice: Choose the best answer for each of the following. (3 pts each)

  1. The atomic number is equal to the number of:
  2. Neutrons
  3. Electrons
  4. Protons
  5. Ions
  1. A(n) ______is an atom that has lost or gained neutrons, while a(n) ______is an atom that has lost or gained electrons.
  2. Cation, Anion
  3. Isotope, Ion
  4. Ion, Isotope
  5. Anion, Cation
  1. Which of the following would be a good visual representation of Thomson’s atomic model?
  2. A slice of vanilla birthday cake
  3. A marble in the center of a football stadium
  4. The earth orbiting the sun
  5. A chocolate chip cookie
  1. A(n) ______is a negatively charged subatomic particle, a(n) ______is a positively charged subatomic particle, and a(n) ______is a neutral subatomic particle.
  2. Proton, neutron, electron
  3. Neutron, proton, electron
  4. Electron, proton, neutron
  5. Electron, neutron, proton
  1. The ______is the dense center of the atom that is made up of protons and neutrons.
  2. Empty space
  3. Nucleus
  4. Orbital
  5. Electron
  1. All of the following are forces found in the atom EXCEPT:
  2. Weak force
  3. Small force
  4. Gravitational force
  5. Electromagnetic force

Complete the following table using your periodic table of elements.(3 points each)

Symbol / Name / Atomic Number / # of Protons / # of Neutrons / # of Electrons / Mass Number / Atomic Mass
1. / C / 6
2. / 10 / 20
3. / 25 / 30
4. / 53 / 127

Match the Terms (2 points each)

______1. The production of electrons when light is shone onto a metal with enough energy.

______2. The center of the atom, made up of protons and neutrons.

______3. The location and speed of an electron cannot be determined simultaneously.

______4. The location where an electron is most likely to be found.

  1. Photoelectric effect
  2. Nucleus
  3. Heisenberg Uncertainty Principle
  4. Electron Cloud

Short Answers: Answer each of the following in complete sentences. (4 pts each)

  1. How do you determine the Atomic Number of an atom? How do you determine the Mass Number?
  1. What was Thomson’s major discovery involving the atom, and what experiment did he perform to make this discovery? Be specific.
  1. Describe Rutherford’s contribution to our current atomic model – what part of the atom did he discover, and how? How did this change our model of the atom?
  1. The current model of atomic theory relies heavily on work done by Schrodinger and Heisenberg. What were their contributions to the modern model?

Critical Thinking Responses: (8 points each)

  1. Explain our current understanding of electrons –Are they treated as waves, particles, or both, and how do we know this? Where are they located and how can we determine their location? Be as descriptive as you can.
  1. Compare and contrast two of the three theories/models given: Thomson’s Plum Pudding model, Bohr’s planetary model, and the Quantum Mechanical Model. List the similarities and differences between the two, and explain how one contributed to the other. BE SPECIFIC.
  1. Choose one of the following scientists and describe their main contribution to atomic theory and diagram or describe the experiment they performed to discover this: Thomson, Rutherford, Millikan, or Bohr.

EXTRA CREDIT: (+5 points)

Draw a diagram of Dalton’s Atomic Model, Thomson’s Atomic Model, Rutherford’s Atomic Model, Bohr’s Atomic Model, and the Quantum Mechanical Model.