Is it like this:
where one energy value which is a single line in the band can be occupied by multiple electrons - and by one energy value I mean that the exact/precise energy of all the electrons in that level (if they can) must be the same.
Or like this:
Where no matter how close the levels are or how continuous the band is, one single energy line in the band is occupied by only one electron. Of course since there are as many states as there are the number of atoms in the crystal these energy levels are very close.
I am getting different answers from different places. The confusion in this is troubling me in understanding the concept of density of states and that of degeneracy. The concept of density of states say that in a volume there could be different electronic states with the same energy. But this doesn't make sense to me because when bands are formed by combining the single atom states they split and no two of them have the same energy. And each such split state can only hold 2 electrons as the Pauli exclusion principle states. If that is the case then the latter image should be the right one. But the concept of density of states talk about degeneracy at a particular energy value itself, which implies that there exists multiple electrons (comparable to the no of crystal atoms) that share the same energy which if true leads to the first image being accurate.
So my question is again very simple and precise: can multiple electrons (more than two) have the same precise energy (not their energies lying in the same interval E to E + dE) or are the electrons singly occupying precise energies that are very very close and almost a continuum but nevertheless still alone in a particular line in the energy band ?