Onceium

Onceium is a hypothetical element, not currently recognized in the periodic table. The name "Onceium" follows the systematic element naming convention used by IUPAC (International Union of Pure and Applied Chemistry) for temporary names of elements before they are officially synthesized and named. The root "onc" derives from the digit 1, reflecting the hypothetical element's atomic number ending in "1" if it were to be the next element discovered after an element with an atomic number ending in "0". The suffix "-ium" is universally used for elements.

Therefore, "Onceium" would be a placeholder name for a hypothetical element with an atomic number of, for example, 121, 131, 141, etc., pending its discovery and official naming by IUPAC. Its predicted properties would depend on its electronic configuration and placement within the periodic table, based on trends observed in existing elements. Predicting these properties accurately, however, becomes increasingly challenging as atomic numbers increase, due to relativistic effects and other complex quantum phenomena.

Until an element is officially synthesized and its properties characterized, the name "Onceium" remains purely theoretical.