Development of Atomic Models
Chemistry ⇒ Atomic Structure and the Periodic Table
Development of Atomic Models starts at 8 and continues till grade 12.
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Context: In the early 20th century, several atomic models were proposed to explain the structure of the atom. Compare and contrast the Thomson and Rutherford models of the atom.
Describe one experimental observation from Rutherford’s gold foil experiment that led to the nuclear model of the atom.
Describe the main idea behind Dalton’s atomic theory.
Explain why the discovery of the electron led to the revision of Dalton’s atomic theory.
Rutherford’s model of the atom proposed that:
State one limitation of Rutherford’s atomic model.
State one major limitation of Thomson’s atomic model.
Context: In the early 20th century, several atomic models were proposed to explain the structure of the atom. Compare and contrast the Thomson and Rutherford models of the atom.
Which experiment led to the discovery of the nucleus?
(1) Cathode ray tube experiment
(2) Gold foil experiment
(3) Oil drop experiment
(4) Hydrogen discharge tube experiment
Which of the following is a correct statement about the gold foil experiment?
(1) All alpha particles passed straight through the foil.
(2) Most alpha particles were deflected at large angles.
(3) A few alpha particles were deflected at large angles.
(4) No alpha particles were deflected.
Which of the following is NOT explained by Bohr’s model?
(1) Line spectra of hydrogen
(2) Zeeman effect
(3) Stability of the atom
(4) Existence of isotopes
Which of the following statements about Rutherford’s model is correct?
(1) Electrons are embedded in a positive sphere.
(2) Electrons revolve around a dense nucleus.
(3) Atoms are indivisible.
(4) Electrons are stationary inside the atom.
Fill in the blank: According to Bohr’s model, electrons revolve around the nucleus in fixed ________ or energy levels.
Fill in the blank: The ________ model could not explain the observation of discrete spectral lines in hydrogen.
Fill in the blank: The ________ model of the atom was the first to explain the hydrogen emission spectrum.
Fill in the blank: The discovery of the ________ led to the modification of Dalton’s atomic theory.
True or False: According to Bohr’s model, electrons emit energy while revolving in their stationary orbits.
True or False: According to Dalton’s atomic theory, atoms of different elements can combine in simple whole-number ratios to form compounds.
True or False: J.J. Thomson discovered the electron using the cathode ray tube experiment.
True or False: The Bohr model is applicable to all atoms, including multi-electron atoms.
