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 gold foil experiment, most alpha particles passed straight through the foil, but a few were deflected at large angles. What conclusion was drawn from this observation?
Describe one experimental observation from the gold foil experiment that led to the nuclear model of the atom.
Describe the main features of Dalton’s atomic theory.
Describe the main idea behind the Heisenberg uncertainty principle.
Explain the main difference between Bohr’s model and the quantum mechanical model of the atom.
Explain why the Bohr model was considered an improvement over Rutherford’s model.
Explain why the discovery of the neutron was important for the understanding of atomic structure.
Context: In the gold foil experiment, most alpha particles passed straight through the foil, but a few were deflected at large angles. What conclusion was drawn from this observation?
Which experiment provided evidence for the existence of the nucleus?
(1) Cathode ray tube experiment
(2) Gold foil experiment
(3) Oil drop experiment
(4) Photoelectric effect experiment
Which of the following best describes Bohr’s model of the atom?
(1) Electrons move in fixed orbits around the nucleus.
(2) Electrons are randomly distributed in a positive sphere.
(3) Atoms are indivisible.
(4) Electrons are located only in the nucleus.
Which of the following is NOT a feature of Rutherford’s atomic model?
(1) Most of the atom is empty space.
(2) Electrons revolve around the nucleus.
(3) The nucleus contains protons and neutrons.
(4) The nucleus is positively charged.
Which of the following is NOT a limitation of Bohr’s model?
(1) It cannot explain spectra of multi-electron atoms.
(2) It violates the uncertainty principle.
(3) It explains the Zeeman effect.
(4) It assumes circular orbits for electrons.
Fill in the blank: According to Bohr’s model, when an electron jumps from a higher energy level to a lower one, it ________ energy.
Fill in the blank: The ________ equation is used to describe the behavior of electrons in atoms in the quantum mechanical model.
Fill in the blank: The ________ model could not explain the chemical properties of elements.
Fill in the blank: The ________ model introduced the concept of atomic orbitals.
True or False: According to Bohr’s model, electrons can exist between energy levels.
True or False: According to Dalton, atoms of different elements can have different masses.
True or False: The discovery of the neutron helped explain the difference between atomic number and mass number.
True or False: The plum pudding model suggested that electrons are embedded in a positively charged sphere.
