Unhexquadium

Unhexquadium is the temporary systematic name for the hypothetical chemical element with atomic number 164. No confirmed synthesis or observation of this element has been reported.

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IUPAC systematic element names: A numerical naming system for elements whose permanent names have not been approved. Unhexquadium combines roots for its atomic-number digits under this naming system.
Nuclear fusion: A nuclear reaction in which two atomic nuclei combine to form a heavier nucleus. Heavy-element experiments create candidate nuclei by fusing projectile and target nuclei.
IUPAC: The international organization that standardizes chemical nomenclature, terminology, and measurement conventions. IUPAC established the systematic naming rules used for hypothetical element 164.
Extended periodic table: A proposed continuation of the periodic table beyond the elements currently known. Element 164 lies in the speculative region that extended-table models attempt to describe.
Atomic number: The number of protons in an atomic nucleus, which defines the chemical element. The value 164 determines which hypothetical element unhexquadium names.
Heavy-ion collision: A collision between atomic nuclei accelerated to high energies, used to study nuclear matter and synthesize heavy nuclei. Such collisions are the experimental route used to produce candidate superheavy nuclei.
Systematic element name: A temporary element name constructed from the digits of its atomic number using standardized numerical roots. Unhexquadium is the systematic placeholder formed from the digits 1, 6, and 4.
Relativistic chemistry: The study of how relativistic effects alter the electronic structure and chemistry of heavy atoms. At extreme nuclear charge, these effects could make predicted chemistry depart from simple periodic trends.
Periodic table: A tabular arrangement of chemical elements ordered chiefly by atomic number and recurring chemical properties. Element 164 would extend the table beyond all currently confirmed elements.
Neutron capture: A nuclear reaction in which an atomic nucleus absorbs a neutron. Neutron-rich reaction pathways are studied as possible routes toward heavier nuclei.