Elementidel

Elementidel is a hypothetical chemical element proposed in discussions of an extended periodic table. In many models, it would have an atomic number in the range of 170 to 210 and would lie in the uppermost regions of the periodic table, potentially in the eighth or ninth period. As with other superheavy elements, its predicted position is sensitive to relativistic effects on electron structure.

The name elementidel combines “element” with a conventional suffix used for hypothetical elements; common speculative symbols include Edl or EID, though no official symbol exists.

Predicted properties are model-dependent. Many calculations predict extreme instability with lifetimes very short; relativistic effects could lead to unusual electron configurations and a tendency toward high-density, metallic character; some models anticipate a range of oxidation states, though practical chemistry would be challenging.

If synthesized, elementidel would likely be produced by heavy-ion fusion experiments using very heavy targets and light projectiles at high energies, followed by rapid chemical and radiochemical analysis of decay chains. No experimental observation has been reported as of now.

The concept of elementidel serves as a testbed for theories of the periodic table, nuclear stability, and relativistic quantum chemistry. It remains speculative; confirmation would require independent replication and careful decay-chain analysis.