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
A neutral atom has 11 protons and 12 neutrons. What is its mass number?
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.
In the gold foil experiment, most alpha particles passed through the foil undeflected. What does this observation suggest about the structure of the atom?
State one difference between Rutherford’s and Bohr’s atomic models.
State one reason why the Plum Pudding Model was rejected.
A certain atom has 17 protons, 18 neutrons, and 17 electrons. Calculate its mass number and state whether it is a neutral atom or an ion.
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?
Describe one experimental observation that led to the rejection of the Plum Pudding Model and explain how it supported the nuclear model of the atom.
Explain how the quantum mechanical model of the atom differs fundamentally from Bohr’s model in describing the position of electrons.
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.
Context: An atom has 15 protons, 16 neutrons, and 18 electrons.
Determine the charge of the atom and explain whether it is a cation or an anion.
Context: In a certain experiment, electrons are fired at a thin metal foil. Unlike alpha particles, the electrons are deflected by much larger angles and some are even reflected back.
Explain why the deflection pattern of electrons is different from that of alpha particles in the gold foil experiment, based on atomic models.
Describe one way in which the discovery of isotopes challenged Dalton’s atomic theory.
Explain why the quantum mechanical model is considered more accurate than the Bohr model for describing the behavior of electrons in atoms.
