Oganessonin

Oganessonin is a hypothetical superheavy chemical element with the placeholder symbol Og and atomic number 170. It is located in the predicted g-block of the periodic table. As a theoretical element, Oganessonin has not been synthesized or observed, and its properties are extrapolated based on theoretical models. Its existence and properties are subject to ongoing research and speculation within nuclear physics and chemistry.

The position of Oganessonin in the periodic table suggests it would be the second element in the g-block, following the hypothetical element unhexseptium (UhS) with atomic number 121, if the periodic table were extended to include elements with atomic numbers beyond the current known limit. The g-block itself is a new block of elements theorized to begin with atomic number 121. Elements in this block would have their outermost electrons filling the 5g subshell.

Theoretical predictions for Oganessonin's chemical properties are scarce due to its purely hypothetical nature and the extreme difficulty in synthesizing and studying superheavy elements. Generally, superheavy elements are expected to exhibit relativistic effects that significantly alter their chemical behavior compared to lighter homologues. The stability of Oganessonin, like other superheavy elements, is predicted to be extremely low, with very short half-lives. The concept of an "island of stability" is relevant here, suggesting that certain superheavy isotopes might be more stable than their neighbors, though whether Oganessonin would fall within such an island remains unknown. Research into the theoretical landscape of superheavy elements continues to explore the limits of nuclear existence and the potential for new chemical elements.