Multiple Choice
Which property of an atomic orbital is determined by the principal quantum number (n)?
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9. Quantum Mechanics
Quantum Numbers: Principal Quantum Number
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is NOT a quantum number used to describe electrons in atoms?
A
Principal quantum number (n)
B
Spin quantum number (s)
C
Angular momentum quantum number (l)
D
Atomic mass number (A)
Verified step by step guidance1
Understand that quantum numbers are values that describe the unique quantum state of an electron in an atom, including its energy, shape, orientation, and spin.
Recall the four quantum numbers used in atomic theory: the principal quantum number (\(n\)), the angular momentum quantum number (\(l\)), the magnetic quantum number (\(m_l\)), and the spin quantum number (\(s\)).
Recognize that the principal quantum number (\(n\)) indicates the main energy level or shell of the electron.
Know that the angular momentum quantum number (\(l\)) describes the shape of the orbital, and the spin quantum number (\(s\)) describes the electron's intrinsic spin.
Identify that the atomic mass number (\(A\)) is not a quantum number; it represents the total number of protons and neutrons in the nucleus, not a property of the electron's quantum state.
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