Question

Which quantum number determines the shape of an orbital?

• A. Principal quantum number
• B. Azimuthal quantum number
• C. Magnetic quantum number
• D. Spin quantum number

Hint:

Think of the quantum numbers as an address: $n$ is the City (size), $l$ is the Building Shape, $m_l$ is the Room Orientation, and $m_s$ is the Bed Choice!

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Quantum numbers are a set of four numbers used to describe the location, energy, and behavior of electrons in an atom.

Step 2: Detailed Explanation:
Each quantum number has a specific role:
• Principal ($n$): Determines the size and energy of the orbital.
• Azimuthal ($l$): Also known as the orbital angular momentum quantum number, it determines the three-dimensional shape of the orbital (e.g., $l=0$ is spherical $s$, $l=1$ is dumbbell $p$).
• Magnetic ($m_l$): Determines the spatial orientation of the orbital.
• Spin ($m_s$): Determines the direction of electron spin.

Step 3: Final Answer:
The Azimuthal quantum number determines the shape of the orbital.