Chemistry Atomic Structure BUMHS 2024
PMDC Verified Question 15 of 95
An electron in an atom is completely describe by its ____ quantum numbers
A
Eight
B
Six
C
Five
D
Four
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Four
Concept: The state of any electron in a quantum mechanical atomic model is defined by a specific set of parameters called quantum numbers.

Formula: None required.

Solution:
  • To completely describe the unique address and state of an electron in an atom, exactly four quantum numbers are required:
  • 1. Principal (\( n \)): Energy level / Shell.
  • 2. Azimuthal (\( l \)): Orbital shape / Subshell.
  • 3. Magnetic (\( m \)): 3D spatial orientation.
  • 4. Spin (\( s \)): Direction of intrinsic electron spin.
  • According to the Pauli Exclusion Principle, no two electrons can share the same set of these four numbers.


Why other options are incorrect: There are strictly four recognized quantum numbers used to define an electron's state.

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