Multiple Choice
How many electrons can the first energy level (n = 1) of an atom hold?
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9. Quantum Mechanics
Quantum Numbers: Number of Electrons
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many quantum numbers are required to uniquely describe the energy state of an electron in an atom?
A
Three
B
Two
C
Four
D
Five
Verified step by step guidance1
Understand that quantum numbers are used to describe the unique quantum state of an electron in an atom, including its energy, shape, orientation, and spin.
Recall the four quantum numbers: the principal quantum number (\(n\)), the azimuthal (angular momentum) quantum number (\(\ell\)), the magnetic quantum number (\(m_\ell\)), and the spin quantum number (\(m_s\)).
Recognize that the principal quantum number (\(n\)) defines the main energy level or shell of the electron.
Know that the azimuthal quantum number (\(\ell\)) defines the shape of the orbital, the magnetic quantum number (\(m_\ell\)) defines the orientation of the orbital, and the spin quantum number (\(m_s\)) defines the spin direction of the electron.
Conclude that all four quantum numbers together are required to uniquely describe the energy state of an electron in an atom.
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