How many possible values of mₛ are there for an electron with n = 4, l = 2, mₗ = 1?
For a specific orbital, mₛ = +1/2 or -1/2. Total = 2.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Shapes of Orbitals - s p d f and Nodes and Radial Probability