An emission spectrum from a nebula shows bright lines at 410 nm, 434 nm, 447 nm, 468 nm, 486 nm, and 656 nm. Laboratory reference data list prominent lines (in nm) for three elements:
Hydrogen: 410, 434, 486, 656
Helium: 447, 468, 502, 588
Neon: 585, 640, 703
Rank the three elements from most likely to least likely to be present in the nebula and justify your ranking in one or two sentences.