I posted a question on Chemistry Stack Exchange a while back. It was related to the naming of atomic orbitals. One of the answers to it mentioned a research experiment. The link to the question is given below.
As mentioned in the answer, alkali metals show various different bands of spectrum, on the basis of which we named the S, P, D and F orbitals.
But I didn't get why we don't have these seperate spectra in Hydrogen. (I've studied Hydrogen Spectrum in my classes, and it doesn't talk about anything like this. It only talks about Bohr using them to justify the quantisation of energy.) So what makes Hydrogen different?
Also, do elements other than alkali metals show a similar spectrum pattern or is it a single spectrum like Hydrogen? Which ones do? What's the defining criteria for a single spectrum and multiple spectrum?