Why isn't there an unundecium yet?

Answer 1

Because Ununoctium is the latest element in the table so far, it's half life is less than 1 millisecond and only 3 or 4 atoms have ever been produced. Unundecium is theoretically possible, but barely, not with today's technology

Different person: Also, even if there was, it wouldn't be called unundecium, because that means 'one one ten'. It would be called 'unbinillium' because it means 'one(un)two(bi)zero(nill)'.

Answer 2

Ununennium (Uue) is the temporary IUPAC name for element 119. It has not been officially named yet because it has not been confirmed by the International Union of Pure and Applied Chemistry (IUPAC). The discovery and confirmation process for new elements can take time as researchers need to provide robust evidence of their existence.