Linked from
The 32 pages that link to Superheavy element synthesis, each with the reason it gives.
UnbipentiumRelated: No demonstrated synthesis has established that element 125 can be made.
UnhexoctiumRelated: Any claim of element 168 would require producing and identifying its nuclei.
UnhexpentiumRelated: Existing synthesis methods have not established a route to atomic number 165.
UnhexquadiumRelated: New production methods would be needed to test whether element 164 can be made.
UnpentpentiumRelated: Any claim of element 155 would require producing and identifying its nuclei.
UnquadenniumRelated: No demonstrated production pathway has reached atomic number 149.
UntrioctiumRelated: Experiments in this field would test whether untrioctium can be produced.
UntriquadiumRelated: No established method has produced an element anywhere near atomic number 134.