Atomic Models
Physics ⇒ Modern Physics
Atomic Models starts at 9 and continues till grade 12.
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See sample questions for grade 9
Describe one way in which Bohr’s model improved upon Rutherford’s model.
Describe the main features of Rutherford’s atomic model.
Describe the main idea of Dalton’s atomic theory.
Explain why most alpha particles passed straight through the gold foil in Rutherford’s experiment.
A scientist bombards a thin sheet of metal with fast-moving alpha particles. Most particles pass through, but a few are deflected at large angles. What does this observation suggest about the structure of the atom?
Context: An atom has 11 protons, 12 neutrons, and 11 electrons. According to modern atomic theory, what is the mass number and atomic number of this atom?
Context: In a hypothetical experiment, a beam of electrons is directed at a thin sheet of gold foil. Most electrons pass through, but some are deflected at large angles. What does this suggest about the structure of the atom?
Context: An atom has 17 protons, 18 neutrons, and 17 electrons. Calculate its mass number and explain which element it is.
Which experiment provided evidence for the existence of electrons?
(1) Gold foil experiment
(2) Cathode ray tube experiment
(3) Oil drop experiment
(4) Photoelectric effect experiment
Which of the following best describes the location of electrons in the modern atomic model?
(1) Fixed orbits
(2) Randomly scattered
(3) In a cloud around the nucleus
(4) Inside the nucleus
Which of the following best explains why atoms are electrically neutral?
(1) They have more protons than electrons
(2) They have equal numbers of protons and electrons
(3) They have more neutrons than protons
(4) They have no subatomic particles
Which of the following is NOT a feature of Bohr’s atomic model?
(1) Electrons move in fixed orbits
(2) Electrons radiate energy while in stationary orbits
(3) Energy is absorbed or emitted when electrons jump between orbits
(4) The angular momentum of electrons is quantized
According to Bohr’s model, electrons revolve around the nucleus in ________ orbits without radiating energy.
Fill in the blank: In the modern atomic model, electrons are found in regions called ________.
Fill in the blank: The ________ model of the atom was the first to explain atomic emission spectra.
Fill in the blank: The atomic number of an element is equal to the number of ________ in its nucleus.
Is it correct to say that the nucleus is positively charged?
Is it true that in Thomson’s model, electrons are embedded in a sphere of positive charge?
True or False: According to Bohr’s model, the energy of an electron increases as it moves to orbits farther from the nucleus.
True or False: According to Dalton, atoms can be divided into smaller particles.
