Unquadhexium

Unquadhexium is the temporary systematic name for hypothetical element 146, assigned from its atomic number under IUPAC naming rules. No atom of the element has been observed.

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Atomic number: The number of protons in an atom’s nucleus, defining which chemical element it is. Element 146 is specified by its proton count, not by a measured chemical property.
Superheavy element: A chemical element with atomic number 104 or greater, generally produced in nuclear reactions. Unquadhexium lies in the superheavy region, where synthesis becomes increasingly difficult.
International Union of Pure and Applied Chemistry: The international organization that develops standards and recommendations for chemistry, including element naming. IUPAC established the systematic naming procedure that generates unquadhexium.
Extended periodic table: Proposed arrangements of chemical elements beyond the currently confirmed periodic table. Element 146 would occupy a position in a still-hypothetical extension of the table.
Chemical element: A pure substance whose atoms all have the same number of protons. Unquadhexium would be a distinct element if nuclei with 146 protons were produced.
Nuclear fusion: A process in which atomic nuclei combine to form a heavier nucleus. Fusion reactions are a principal route used to attempt synthesis of superheavy nuclei.
IUPAC systematic element naming: A digit-by-digit method for assigning temporary names to elements without approved permanent names. Its numerical roots yield unquadhexium from atomic number 146.
Relativistic chemistry: The study of chemical effects arising when electrons in heavy atoms move at relativistic speeds. If unquadhexium exists, relativistic effects would complicate predictions of its electronic structure.
IUPAC systematic element name: A temporary element name formed from digit roots and the suffix -ium under IUPAC rules. The name unquadhexium encodes the digits of atomic number 146.
Particle accelerator: A device that uses electromagnetic fields to accelerate charged particles to high energies. Accelerated ion beams can be directed at target nuclei in searches for new elements.