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Lesson Worksheet: The Atomic Model Chemistry • 10th Grade

In this worksheet, we will practice describing the differences between historical models of the atom and what drove the development of one model to the next.


Which theory of the atom came first: Rutherford’s nuclear model, Bohr’s orbital model, Dalton’s hard sphere model, or Thomson’s plum pudding model?

  • AThomson’s plum pudding model
  • BDalton’s hard sphere model
  • CBohr’s orbital model
  • DRutherford’s nuclear model


In the Geiger-Marsden experiments supervised by Ernest Rutherford (known as the Rutherford gold foil experiment), which type of particle was scattered by gold foil, proving that atoms contain dense nuclei?

  • A𝛽 particles
  • B𝛼 particles
  • CNeutrons
  • DGamma rays
  • E𝛽 particles


What step forward from Bohr’s orbital model of the atom was made by Schrödinger in his electron cloud model?

  • AThe nucleus contains particles with mass and positive charge.
  • BElectrons are spread out over space.
  • CElectrons are moving within a positively charged sphere.
  • DElectrons occupy shells with fixed radii.
  • EThe nucleus contains particles with mass but no charge.


How was the plum pudding model different from the hard-sphere model of the atom?

  • AThe plum pudding model showed electrons making up the corners of a cube.
  • BThe plum pudding model included negatively charged particles known as electrons.
  • CThe plum pudding model included positively charged particles known as protons.
  • DThe plum pudding model described electrons orbiting a central nucleus.
  • EThe plum pudding model showed electrons occupying different energy levels.


Which chemist discovered that electrons exist at fixed energy levels?

  • ABohr
  • BThomson
  • CDalton
  • DGeiger and Marsden
  • ERutherford


James Chadwick proved the existence of .

  • Athe quantum atomic model
  • Bthe electron cloud model
  • Cthe electron
  • Dthe neutron
  • Ethe proton


Which of the following is the new model of the atom that replaced Dalton’s model in 1897?

  • ABohr’s model
  • BModern atomic model
  • CThomson’s model
  • DGeiger’s model
  • ERutherford’s model


Which diagram most closely represents Bohr’s electron shell model of the atom?

  • A
  • B
  • C
  • D
  • E


Which diagram most closely represents Rutherford’s nuclear or planetary model of the atom?

  • A
  • B
  • C
  • D
  • E


Which diagram most closely represents Thomson’s model of the atom?

  • A
  • B
  • C
  • D
  • E

This lesson includes 55 additional questions for subscribers.

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