Multiple Choice
Which of the following combinations of principal quantum number n and angular momentum quantum number l are not allowed?
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9. Quantum Mechanics
Quantum Numbers: Angular Momentum Quantum Number
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Which quantum number is primarily used to specify the angular momentum (subshell) of an electron in an atom?
A
The azimuthal (angular momentum) quantum number, l
B
The principal quantum number, n
C
The spin quantum number, m_s
D
The magnetic quantum number, m_l
Verified step by step guidance1
Understand that quantum numbers describe specific properties of electrons in atoms, such as energy levels, shape, orientation, and spin.
Recall the four quantum numbers: principal quantum number (\(n\)), azimuthal (angular momentum) quantum number (\(l\)), magnetic quantum number (\(m_l\)), and spin quantum number (\(m_s\)).
Identify that the principal quantum number (\(n\)) indicates the main energy level or shell of the electron.
Recognize that the azimuthal quantum number (\(l\)) defines the shape of the orbital, which corresponds to the subshell and is directly related to the electron's angular momentum.
Note that the magnetic quantum number (\(m_l\)) specifies the orientation of the orbital in space, and the spin quantum number (\(m_s\)) describes the electron's spin direction.
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