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. Theoretical calculations suggest that elements beyond the current known periodic table, including heliumsa, might possess an "island of stability" where certain isotopes could have longer half-lives due to specific proton and neutron configurations. However, reaching this island is a significant experimental challenge.

If synthesized, heliumsa would be expected to exhibit chemical properties similar to other alkaline earth metals like calcium and barium, but with relativistic effects potentially influencing its reactivity. Its exact properties are speculative, as it would likely decay too rapidly to be studied extensively. The search for superheavy elements like heliumsa is an active area of research in nuclear physics and chemistry, aiming to expand our understanding of atomic structure and the limits of nuclear stability.