Monotium
Monotium is a hypothetical element with the symbol Mt and atomic number 120. It is predicted to be an alkaline earth metal, situated in the s-block of the periodic table. As a superheavy element, monotium is expected to be highly unstable and radioactive, with a very short half-life. Its existence has not yet been experimentally confirmed, and it remains a theoretical entity within nuclear physics and chemistry.
The synthesis of element 120 would likely involve bombarding heavy target nuclei with lighter projectile nuclei.