The only invalid electron state and shell designation among the following is
A)1s,K (n = 1)shell.
B)2s,L (n = 2)shell.
C)2d,L (n = 2)shell.
D)3s,M (n = 3)shell.
E)3d,M (n = 3)shell.

Question

Quizplus · Accepted Answer

The designation "2d" is not a valid shell designation. The allowed azimuthal quantum numbers (l values) for a given principle quantum number (n) are 0 through n-1. For n=2, the allowed l values are 0 and 1, corresponding to the s and p orbitals. There is no d orbital for n=2.

The Only Invalid Electron State and Shell Designation Among the Following