Periodine

Periodine is a fictional chemical element commonly employed in theoretical chemistry exercises and science fiction to explore extended periodic tables. It is not recognized by any scientific database and has no experimental basis. The term periodine is used as a placeholder to discuss how new elements might fit into existing chemical concepts, such as bonding, electronegativity, and oxidation states.

In speculative models, periodine is described as a heavy, nonmetal with high electronegativity and a variety of oxidation states, frequently depicted as forming oxides and halide-like compounds. Authors differ on whether it behaves more like a halogen in its chemistry or as a heavier successor to oxygen, and some scenarios place it in a hypothetical seventh- or eighth-period group. The exact properties—such as its preferred oxidation states, reactivity, and compound stability—vary between depictions.

Occurrence and production: purely hypothetical; no natural occurrence or laboratory synthesis has been demonstrated. In educational contexts, periodine serves to illustrate how chemical properties scale with atomic number and how existing bonding models may need extension. Applications: none in reality; its use is limited to pedagogy and speculative fiction. Safety: no empirical safety data exist; it is treated as a conceptual construct rather than a real substance.