1. There is no upper limit to the system, i.e., there is no "last element." The system is open, and according to current methods, it is possible to synthesize new elements with larger numbers (although there is virtually no practical use for this: they all decay in fractions of a second).
2. Of all the synthesized elements, only the 115th element has been officially recognized by the scientific community: The Periodic Table will be supplemented with the 115th element. Note the publication date: August 28, 2013.
All subsequent elements are still quite ephemeral (superactinides are purely theoretical). They are no more real than unobtanium.
In 2010, with the synthesis of element 117, the seventh period of the periodic table was completed, and the problem of the lower limit of Mendeleev's table remains one of the most important in modern theoretical chemistry.
I wrote this not to offend anyone, but simply out of a love for accuracy: let's stick to the facts. :)
(Василь Симоненко. Люди – прекрасні)