If in 1 "have this property" means 4 different vowels, then the elements are:
Caesiumn (Cs)
Flerovium (Fl)
Fluorine (F)
Germanium (Ge)
Lawrencium (Lr)
Magnesium (Mg)
Neodymium (Nd)
Nobelium (No)
Potassium (K)
Promethium (Pm)
This means the second alphabetically is Flerovium. If they mean alphabetical order of abbreviation, then Fluorine.