What is the atomiic structure of the elements given?

Next, look at the emission line spectra for the following elements:

Hydrogen (H), Helium (He), Oxygen (O), Neon (Ne), Argon (Ar)

(atomic numbers 1, 2, 8, 10, and 18)

    Judging from the number of visible energy-level transitions (lines) in the spectra, list the above elements in order starting from least complex to most complex atomic structure? (Note, however, that number of visible emission lines does not necessarily indicate atomic complexity.)  Does the order you listed make sense?  Do a little research (reading text or using the web) and write a few sentences explaining your answer.