Quantum number in hydrogen atom

[yecko]

Homework Statement

http://i.imgur.com/GQ9Xk6d.png

Homework Equations

Quantum mechanical model of atomic structure

The Attempt at a Solution

Why all sets are allowed?
H atom only got one e- which only one orbital should be there, isn't it?
If there aren't second or more e- , no second orbital or higher number of orbital, how comes there is higher number of shells (principle n) ? Hence as do the the number of angular momentum (l) for subshell and magnetic (ml) for the variety of orientation?

I am a newbie to QM, who learned only Bohr's model in high school.
Thank you very much.

 

[Borek]

Electron can get excited. You are thinking in terms of the the lowest energy level it can occupy - which is not a bad starting point, but it is not a whole story either. When it gets excited it can jump up to any orbital, described by any set of valid quantum numbers.

 

[yecko]

i see.
thank you very much