Worksheet: The Atomic Model

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.

Q1:

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

Q2:

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

Q3:

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.

Q4:

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.

Q5:

Which chemist discovered that electrons exist at fixed energy levels?

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

Q6:

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

  • ABohr’s electron shell model
  • BThe cubical model
  • CThomson’s plum pudding model
  • DThe Saturnian model
  • ERutherford’s model

Q7:

James Chadwick proved the existence of .

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

Q8:

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

  • A
  • B
  • C
  • D
  • E

Q9:

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

  • A
  • B
  • C
  • D
  • E

Q10:

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

  • A
  • B
  • C
  • D
  • E

Q11:

Which of the following ideas was not supported by Dalton’s solid sphere model of the atom?

  • AAtoms of the same element are identical.
  • BAtoms can be divided into smaller parts.
  • CAtoms can chemically combine to form compounds.
  • DAtoms of one element are never transformed into atoms of another element.
  • EAll elements are made of atoms.

Q12:

Which of the following was a conclusion drawn by Rutherford after his gold-leaf experiment?

  • AThe neutrons and protons in atoms are made of quarks.
  • BThe atom is mostly empty space.
  • CThe protons, neutrons, and electrons are spread evenly throughout the atom.
  • DAtoms are indestructible.
  • EAtoms contain subatomic particles called neutrons.

Q13:

How was J. J. Thomson’s plum pudding model different from Dalton’s solid sphere model of the atom?

  • AJ. J. Thomson’s model included subatomic particles called electrons.
  • BJ. J. Thomson’s model showed electrons orbiting a central nucleus.
  • CJ. J. Thomson’s model included subatomic particles called neutrons.
  • DJ. J. Thomson’s model showed electrons occupying fixed energy levels.
  • EJ. J. Thomson’s model included a positively charged central nucleus.

Q14:

Complete: In Rutherford's atomic model, he concluded that .

  • Athe mass of the atom is equally distributed throughout the whole atom
  • Bmost of the atomic mass is located inside the nucleus
  • Cthe charge of an electron was determined
  • Dthe plum pudding model of the atom was confirmed
  • Ebeta particles bombarded a thin sheet of gold leaf

Q15:

Which of the postulates of Dalton’s atomic theory is no longer valid?

  • AThe atom is the smallest unit of matter that can take part in a chemical reaction.
  • BAtoms are not created or destroyed in chemical reactions.
  • CCompounds are combinations of two or more different types of atoms.
  • DAll the atoms of a given element have identical masses.

Q16:

Which of the following is not one of the postulates of the Bohr atomic model?

  • AIt explains the line spectrum of hydrogen atoms.
  • BElectrons revolve in definite circular orbits around the nucleus.
  • CWhen an electron jumps from a higher orbit to a lower orbit, it absorbs energy in the form of radiation.
  • DElectrons in an orbit do not radiate energy and spiral into the nucleus.
  • EWhen an electron jumps from a higher orbit to a lower orbit, it releases energy in the form of radiation.

Q17:

Which of the experiments listed below did not match its given conclusion?

  • AThe Rutherford experiment was useful in determining the nuclear charge on the atom.
  • BThe Rutherford experiment confirmed the presence of a positively charged nucleus in the center of the atom.
  • CThe Rutherford experiment proved the Thomson plum pudding model of the atom to be essentially correct.
  • DThomson’s work on the electric discharge tube showed the existence of negatively charged particles called electrons.
  • EMillikan’s oil drop experiment determined the charge of the electron.

Q18:

If the plum pudding model was correct, predict the paths taken by the α particles that are fired at gold foil.

  • AMost of the α particles will pass straight through the foil and very few α particles will be deflected at large angles.
  • BVery few α particles will pass through the foil and most of the α particles will be deflected at large angles.
  • CVery few α particles will be deflected at large angles and most of the α particles will be deflected at small angles.
  • DMost of the α particles will pass straight through the foil and very few α particles will come straight back off of the foil.
  • EMost of the α particles will pass straight through the foil and a few α particles will be deflected at small angles.

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