Quantum numbers: An electron in a hydrogen atom has orbital quantum number l = 4. How many possible values of the magnetic quantum number m_l could it have?

Question

Quizplus · Accepted Answer

The magnetic quantum number $ m_l $ can take values from $-l$ to $+l$, including zero. For $ l = 4 $, $ m_l $ can be $-4, -3, -2, -1, 0, 1, 2, 3, 4$, which gives a total of 9 possible values.

Quantum Numbers: an Electron in a Hydrogen Atom Has Orbital