Chemistry Atomic Structure MDCAT 2010
PMDC Verified Question 95 of 95
Which quantum number tells us about orientation of orbitals?
A
Principal quantum number
B
Spin quantum number
C
Magnetic quantum number
D
Azimuthal quantum number
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Magnetic quantum number
Concept: Quantum numbers describe the properties of atomic orbitals and the properties of electrons in orbitals.

Formula: None required.

Solution:
  • The principal quantum number (\(n\)) describes energy and size.
  • The azimuthal quantum number (\(l\)) describes the shape of the orbital.
  • The magnetic quantum number (\(m\)) describes the orientation of the orbital in three-dimensional space.
  • The spin quantum number (\(s\)) describes the spin of the electron.


Why other options are incorrect: Principal, spin, and azimuthal describe size/energy, spin, and shape respectively, not 3D spatial orientation.

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