Quiz 5.1 Developing the Atomic Theory

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What is the smallest particle of a substance that still has all the properties of that substance?
1. Atom
2. Element
3. Electron
4. Nucleus
When John Dalton came up with the modern atomic theory in the early 1800's, he imagined how atoms would look. Which of the following diagrams best represents his theory?
1. Diagram W
2. Diagram X
3. Diagram Y
4. Diagram Z
Which of the following diagrams best represents J.J. Thomson's theory about atoms?
1. Diagram X
2. Diagram W
3. Diagram Y
4. Diagram Z
J.J. Thomson was able to produce streams of negatively charged particles from atoms. He called these streams cathode rays. What are cathode rays?
1. Electrons
2. Atoms
3. Nuclei
4. Molecules
Ernest Rutherford found that streams of positively charged particles shot at gold foil went right through the foil except very occasionally one would bounce back as though it had hit something massive in the foil. The following top diagram shows what Rutherford expected to happen based on the Thompson model which was current at the time. The diagram below it shows what he observed.

What did the charged particles hit?
1. Nucleus
2. Atom
3. Electron
4. Molecule
This particle is positively charged and exists in the atom's nucleus.
1. Proton
2. Neutron
3. Electron
4. Nucleus
As research on the atom progressed, the Bohr model evolved into the Quantum Mechanical model. The location and organization of which particle evolved from a point charge locked in position within a shell into a "cloud of probability"?
1. Electron
2. Proton
3. Neutron
4. Atom
Which particle has the smallest mass?
1. Electron
2. Proton
3. Neutron
4. Atom
Which particle or particles have no net charge?
1. Neutrons and atoms
2. Positrons
3. Protons
4. Electrons
What did James Chadwick, a student of Rutherford, discover?
1. Neutrons and protons
2. Electrons
3. Energy levels
4. Quantum mechanics