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.
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
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?
- DGeiger and Marsden
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
James Chadwick proved the existence of .
- Athe quantum atomic model
- Bthe electron cloud model
- Cthe electron
- Dthe neutron
- Ethe proton
Which diagram most closely represents Rutherford’s nuclear or planetary model of the atom?
Which diagram most closely represents Bohr’s electron shell model of the atom?
Which diagram most closely represents Thomson’s plum pudding model of the atom?
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.
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.
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.
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
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.
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.
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.
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.