Unbihexium

Unbihexium is the temporary systematic name for the hypothetical chemical element with atomic number 126. No element with this atomic number has been officially recognized by IUPAC.

Atomic number: The number of protons in an atom’s nucleus, which determines the chemical element. Unbihexium’s proposed identity is defined by having 126 protons.
Island of stability: A predicted region of enhanced stability among superheavy atomic nuclei. Its predictions shape expectations about whether nuclei near element 126 might persist.
Oganesson: The synthetic element with atomic number 118, the heaviest element officially recognized by IUPAC. It marks the current confirmed endpoint of the periodic table, far below 126.
Synthesis of superheavy elements: Experimental production of nuclei with very high atomic numbers through nuclear reactions. Producing a nucleus with 126 protons is the first obstacle to confirming unbihexium.
Chemical element: A substance whose atoms all have the same number of protons. Unbihexium would count as an element if atoms with 126 protons were established.
Nuclear shell model: A model describing nucleons as occupying quantized energy levels within an atomic nucleus. Shell effects are central to estimates of stability for a nucleus with 126 protons.
Nihonium: The synthetic chemical element with atomic number 113, officially recognized and named. Unlike unbihexium, nihonium has been produced and confirmed as an element.
Nuclear fission: The splitting of an atomic nucleus into smaller nuclei, often releasing energy and neutrons. Rapid fission could prevent a newly formed element-126 nucleus from being observed.
IUPAC nomenclature of inorganic chemistry: International rules for naming inorganic substances, including chemical elements and compounds. Its systematic temporary name follows IUPAC’s rules for elements not yet named permanently.
Superheavy element: A chemical element with a very high atomic number, generally beyond the actinide series. Unbihexium belongs to the proposed territory of superheavy elements.

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