Untrinilium

Untrinilium is the temporary systematic name for the hypothetical chemical element with atomic number 130. No element with that atomic number has been confirmed.

Atomic number: The number of protons in an atom’s nucleus, which defines its chemical element. Untrinilium’s proposed identity rests on having 130 protons.
Island of stability: A predicted region of unusually long-lived superheavy nuclei among much less stable isotopes. It motivates searches for nuclei beyond known elements, though element 130’s prospects are uncertain.
IUPAC: The international organization that develops standards and nomenclature for chemistry. IUPAC’s systematic naming rules supply the temporary name untrinilium.
Superheavy element: A chemical element with an atomic number usually defined as 104 or greater. Untrinilium lies within the proposed territory of superheavy-element research.
IUPAC systematic element name: A temporary element name formed from digits in its atomic number using standardized roots and a suffix. Its name encodes 1, 3, and 0 while the element remains undiscovered.
Nuclear shell model: A model of atomic nuclei in which protons and neutrons occupy quantized energy levels. It helps estimate whether any nucleus with 130 protons could resist fission.
Darmstadtium: A synthetic chemical element with atomic number 110, first produced in 1994 and later officially named. Its discovery and naming show the route from temporary systematic names to confirmed element names.
Transfermium Wars: A dispute over priority for discovering and naming elements 104 through 106. Past controversies explain why evidence standards and independent confirmation matter for new elements.
Periodic table: A tabular arrangement of chemical elements ordered by atomic number and recurring chemical properties. Element 130 would extend the table beyond all confirmed elements.
Nuclear fission: The splitting of an atomic nucleus into smaller nuclei, often releasing energy and neutrons. Rapid fission is a major obstacle to producing or observing a nucleus this heavy.

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UnbienniumCompared with: It is the immediately following element in the systematic naming sequence.