Atomic Models
Physics ⇒ Modern Physics
Atomic Models starts at 9 and continues till grade 12.
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See sample questions for grade 10
According to Bohr’s model, what happens when an electron jumps from a higher energy level to a lower energy level?
Describe one major limitation of Rutherford’s atomic model.
Describe the main idea of the quantum mechanical model of the atom.
Explain why electrons do not fall into the nucleus according to Bohr’s model.
A neutral atom has 11 protons and 12 neutrons. What is its mass number?
In the gold foil experiment, most alpha particles passed through the foil undeflected. What does this observation suggest about the structure of the atom?
Context: In a hypothetical experiment, a beam of alpha particles is directed at a thin sheet of a new element. Most particles pass through, but a few are deflected at large angles.
What does this observation suggest about the structure of atoms of this new element?
Context: A scientist proposes a new atomic model in which electrons are stationary within the atom.
Based on your knowledge of atomic models, explain one major flaw in this proposal.
Which atomic model first introduced the concept of quantized energy levels for electrons? (1) Dalton’s model (2) Thomson’s model (3) Rutherford’s model (4) Bohr’s model
Which experiment led to the discovery of the nucleus? (1) Gold foil experiment (2) Cathode ray experiment (3) Oil drop experiment (4) Photoelectric effect experiment
Which model of the atom explained the hydrogen spectrum successfully? (1) Dalton’s model (2) Thomson’s model (3) Rutherford’s model (4) Bohr’s model
Which of the following best describes the main idea of Dalton’s atomic theory? (1) Atoms are made of protons, neutrons, and electrons (2) Atoms are indivisible and indestructible particles (3) Atoms have a central nucleus (4) Atoms have quantized energy levels
Fill in the blank: In Bohr’s model, electrons revolve around the nucleus in fixed ________ orbits.
Fill in the blank: The atomic number of an element is equal to the number of ________ in its nucleus.
Fill in the blank: The mass number of an atom is the sum of the number of ________ and ________ in its nucleus.
Fill in the blank: The nucleus of an atom contains ________ and ________.
True or False: According to Bohr’s model, electrons can exist between two energy levels.
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: According to Rutherford’s model, most of the mass of an atom is concentrated in its nucleus.
True or False: In Thomson’s model, electrons are embedded in a positively charged sphere.
