Multiple Choice
In atomic theory, what best describes an electron cloud?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Orbitals
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In the context of the quantum mechanical model of the atom (orbitals), who stated that an electron’s exact path (position and momentum simultaneously) cannot be predicted with certainty?
A
Niels Bohr (planetary model with fixed electron orbits)
B
Werner Heisenberg (uncertainty principle)
C
J. J. Thomson (plum pudding model)
D
Erwin Schrödinger (wave equation for electron orbitals)
Verified step by step guidance1
Understand that the question is about the quantum mechanical model of the atom and the principle related to the predictability of an electron's position and momentum.
Recall that Niels Bohr proposed the planetary model with fixed electron orbits, which does not address uncertainty in position and momentum.
Recognize that J. J. Thomson proposed the plum pudding model, which is an earlier atomic model not related to quantum uncertainty.
Know that Erwin Schrödinger developed the wave equation describing electron orbitals but did not formulate the principle about uncertainty in position and momentum.
Identify that Werner Heisenberg formulated the Uncertainty Principle, which states that it is impossible to simultaneously know an electron's exact position and momentum with certainty.
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