If the principal quantum number of an electron is n = 5,which one of the following is NOT an allowed magnetic quantum number m_l for the electron? A) 0 B) 2 C) 3 D) 4 E) 5

Question

Quizplus · Accepted Answer

The maximum value of mS for an electron in any given energy level is +1/2 or -1/2. The number of possible values of mS for a given energy level is equal to 2(2l+1). For an electron in n=5 energy level, the possible values of mS would be -1/2, +1/2. Therefore, the only non-allowed value in the given options is 5.

If the Principal Quantum Number of an Electron Is N