Question

4. Given the following sets of quantum numbers for n, I, m, and m, which one of these sets is not possible for an electron in an atom? n I m, m, a. 3 2 2 h b.31-1 ½ c. 4 3 2 ?.5 2.2 ½

Answer 1

4. d. 4 4 -3 -1/2 (This set of quantum numbers is not possible).

Principal quantum number, n can have values form 1,2,3,4,5,....

Azimuthal quantum number, l, can have values 0,1,2,3,4,.... (n-1)

Magnetic quantum number, m_l, can have values, -l to +l, a total of (2l+1) - values.

Spin quantum number, ms, can have values only +1/2 and -1/2 for an electron.

So in d. for n = 4, l can have values 0,1,2 and 3.