The sinle quantum number by Neil.s Bohr and the appearance of several spectral lines in a particular series of Hspectrum, suggest that there more than one quantum to explain all the quantized properties of an electron in a particular energy level inside the atom.
If fact when the properties of the electron is transformed from Cartesian co-ordinate to polar co-ordinates then it becomes the function of `r, theta` and `phi` suggesting three independet quantum numbers. In addition to this a fourth quantum number is required to consider the spinning behaviour of an electron.
The principal quantum number n suggest the orbit number in which electron revolves, Azimuthal quantum number 1 suggest the shape of orbitals, magnetic quantum number m, gives orientation of orbital in presence of external magnetic field, while spin quantum number s, gives direction of an electron about its own axis `n != 0` values of "1" ranges in between 0 to (n-1), while m depends upon 1. Total number values of m = 21+1, and "m" ranges in between -1 to +1 including 0. For each electron spin will be `+-(1)/(2)`

Which of the following is not possible

Options

A. 2s
B. 2d
C. 3f
D. Both b and c

Answer

D