Multiple Choice
Which of the following is the correct ground-state electron configuration for molybdenum (Mo, z = 42)?
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10. Periodic Properties of the Elements
The Electron Configuration
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How does the electron-cloud model describe electrons in an atom?
A
As stationary particles located at precise points around the nucleus
B
As moving in circular paths with definite velocities
C
As occupying specific orbits at fixed distances from the nucleus
D
As existing in a diffuse region of probability around the nucleus
Verified step by step guidance1
Understand that the electron-cloud model is a quantum mechanical concept that describes the behavior of electrons in atoms.
Recognize that unlike earlier models (such as the Bohr model), the electron-cloud model does not depict electrons as particles moving in fixed orbits or paths.
Know that the model represents electrons as existing in regions of space where there is a high probability of finding an electron, rather than at exact points.
These regions are called orbitals, which are often visualized as 'clouds' where the density of the cloud corresponds to the likelihood of the electron's presence.
Therefore, the electron-cloud model describes electrons as existing in a diffuse region of probability around the nucleus, reflecting the uncertainty in their exact position and momentum.
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