• # question_answer The magnetic quantum number for an electron when the value of principal quantum number is 2 can have [CPMT 1984] A)                 3 values                B)                 2 values C)                 9 values                D)                 6 values

When the value of $n=2$, then $l=1$ and the value of $m=-1,\,0,\,+1$ i.e. 3 values.