Magnetic Quantum Number: The Magnetic Effect on Electrons

The video tutorial explains the concept of the magnetic quantum number, which accounts for the splitting of spectral lines in an external magnetic field, known as the Siemens effect. It describes how the magnetic quantum number, represented by ML, is related to the azimuthal quantum number L and determines the orientation of orbitals in space. The tutorial covers the magnetic quantum numbers for different orbitals, including S, P, and D orbitals, and explains their possible orientations and sub-levels in the presence of a magnetic field.

What phenomenon does the magnetic quantum number help explain?

• The speed of light in a vacuum

• The gravitational pull of the Earth

• The color of hydrogen gas

• The splitting of spectral lines in an external magnetic field

What does the magnetic quantum number depend on?

• Rydberg constant

• Principal quantum number

• Azimuthal quantum number

• Spin quantum number

How many orientations can an S orbital have in an external magnetic field?

• Four

• Three

• Two

• One

What is the shape of a P orbital?

• Tetrahedral

• Spherical

• Dumbbell

• Cylindrical

How many sub-orbitals does a P orbital have?

• Four

• Three

• Two

• One

What is the L value for a D orbital?

• Zero

• One

• Two

• Three

Which of the following is a sub-orbital of a D orbital?

• SX

• FZ

• DYZ

• PX