Question:
Which quantum number determines the shape of an orbital?
Which quantum number determines the shape of an orbital?
Show Hint
"l" for "Layout" or "Look" helps remember it defines the shape of the orbital.
Updated On: May 5, 2026
- Principal quantum number (n)
- Azimuthal quantum number (l)
- Magnetic quantum number (m)
- Spin quantum number (s)
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Quantum numbers describe the properties of atomic orbitals and the electrons within them.
Step 2: Meaning
Each quantum number has a specific role: $n$ defines size/energy, $l$ defines shape, $m$ defines orientation, and $s$ defines spin.
Step 3: Analysis
The azimuthal (or angular momentum) quantum number ($l$) relates to the subshell (s, p, d, f), which dictates the geometric shape of the electron cloud.
Step 4: Conclusion
Therefore, the azimuthal quantum number is the one that determines whether an orbital is spherical, dumbbell-shaped, etc. Final Answer: (B)
Quantum numbers describe the properties of atomic orbitals and the electrons within them.
Step 2: Meaning
Each quantum number has a specific role: $n$ defines size/energy, $l$ defines shape, $m$ defines orientation, and $s$ defines spin.
Step 3: Analysis
The azimuthal (or angular momentum) quantum number ($l$) relates to the subshell (s, p, d, f), which dictates the geometric shape of the electron cloud.
Step 4: Conclusion
Therefore, the azimuthal quantum number is the one that determines whether an orbital is spherical, dumbbell-shaped, etc. Final Answer: (B)
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