Multiple Choice
According to the Bohr model, how many electrons occupy the third energy level (n = 3) in a neutral magnesium atom?
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9. Quantum Mechanics
Bohr Model
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According to the Bohr model of the hydrogen atom, what does the principal quantum number n represent?
A
The energy level of the electron's orbit
B
The number of protons in the nucleus
C
The angular momentum of the electron
D
The distance between two adjacent orbits
Verified step by step guidance1
Understand that the Bohr model of the hydrogen atom describes electrons moving in specific circular orbits around the nucleus, each orbit corresponding to a quantized energy level.
Recognize that the principal quantum number \(n\) is an integer (\(n = 1, 2, 3, \ldots\)) that labels these allowed orbits or energy levels.
Know that each value of \(n\) corresponds to a specific energy state of the electron, with higher \(n\) values indicating higher energy levels and larger orbit radii.
Recall that the angular momentum of the electron in the Bohr model is quantized and related to \(n\) by the formula \(L = n \frac{h}{2\pi}\), where \(h\) is Planck's constant, but \(n\) itself directly represents the energy level, not the angular momentum.
Conclude that the principal quantum number \(n\) represents the energy level of the electron's orbit, distinguishing it from other quantities like the number of protons or the distance between adjacent orbits.
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