Question

The orientation of an atomic orbital is governed by

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

Answer 1

The correct option is C

Magnetic quantum number

The explanation for the correct option

(C) Magnetic quantum number

Magnetic orbital quantum number

• It is denoted by $m_l$.
• It gives information about the spatial orientation of the orbital with respect to the standard set of co-ordinate axis.

The explanation for the incorrect option

• Azimuthal quantum numbers tell about the shape of the orbital.
• The spin quantum number denotes the orientation of the spin of the electron.
• The principal quantum number determines the size and to large extent the energy of the orbital.
• So, options (A), (B), and (D) are incorrect.

Hence, option (C) is correct. The orientation of an atomic orbital is governed by magnetic quantum numbers.