The remaining naturally occurring elements were discovered or isolated in subsequent decades, and various additional elements have also been produced synthetically, with much of that work pioneered by Glenn T. Seaborg.
Unsur-unsur alami yang tersisa ditemukan atau diisolasi dalam dekade-dekade berikutnya, dan berbagai unsur tambahan juga telah diproduksi secara sintetis, yang sebagian besar diprakarsai oleh Glenn T. Seaborg.