Heliumsa
Heliumsa is a hypothetical element with atomic number 120. It is predicted to be an alkaline earth metal and would reside in the second group of the periodic table, below radium. As a superheavy element, heliumsa is expected to be highly radioactive and extremely unstable, with a very short half-life. Its existence has not yet been experimentally confirmed, and it remains a theoretical prediction based on extrapolations of periodic trends.
The synthesis of heliumsa would likely involve the fusion of lighter atomic nuclei in particle accelerators.
If synthesized, heliumsa would be expected to exhibit chemical properties similar to other alkaline earth metals