Untrihexium

Untrihexium is the temporary systematic name proposed for hypothetical chemical element 136. No element with this atomic number has been discovered.

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Atomic number: The number of protons in an atom's nucleus, which determines its chemical element. Element 136 would have 136 protons by definition.
Island of stability: A predicted region of enhanced stability among superheavy nuclei with particular proton and neutron numbers. It motivates speculation that some very heavy nuclei could persist long enough to study.
Oganesson: The synthetic chemical element with atomic number 118, the heaviest element currently recognized by IUPAC. Unlike untrihexium, oganesson has been produced and officially named.
Nuclear fission: A nuclear reaction in which a heavy atomic nucleus splits into lighter nuclei, releasing energy and particles. Competing decay pathways would determine whether a hypothetical element 136 nucleus survives.
Periodic table: A tabular arrangement of chemical elements ordered chiefly by atomic number and recurring chemical properties. Untrihexium would extend the table beyond its currently known elements.
Superheavy element: A chemical element with an atomic number far above those found in nature in significant quantities. Element 136 would belong to the superheavy-element regime.
IUPAC: The international scientific organization that standardizes chemical nomenclature, terminology, and measurement. IUPAC establishes official element names after discoveries are validated.
Nuclear decay: The spontaneous transformation of an unstable atomic nucleus through processes such as alpha decay or fission. Any produced element 136 isotope would need a measurable lifetime against decay.
IUPAC systematic element name: A temporary name formed from digit roots for an element whose discovery or official name has not been established. Untrihexium follows the systematic naming scheme for undiscovered elements.
Nuclear shell model: A model describing protons and neutrons as occupying quantized energy levels within an atomic nucleus. Nuclear shell structure helps estimate whether a nucleus as heavy as element 136 could be stable.