Unquadseptium

Unquadseptium is the temporary systematic name for the hypothetical chemical element with atomic number 147. No element with this atomic number has been synthesized or officially recognized.

Connect

Atomic number: The number of protons in an atomic nucleus, which uniquely identifies a chemical element. Element 147 is defined by a nucleus containing 147 protons.
Nuclear shell model: A model that describes nuclear structure through energy levels occupied by protons and neutrons. Its predicted shell closures help estimate whether a nucleus with 147 protons might be unusually stable.
IUPAC systematic element name: A temporary element name formed from the digits of its atomic number using standardized numerical roots and the suffix -ium. Unquadseptium is built from the roots for the digits 1, 4, and 7.
Periodic table extension: Theoretical proposals for organizing chemical elements beyond those currently known. Element 147 raises questions about how far a useful periodic table can extend.
Chemical element: A substance whose atoms have the same number of protons in their nuclei. Unquadseptium names a proposed member of this class, identified by proton count.
Island of stability: A predicted region of relatively long-lived superheavy nuclei among otherwise rapidly decaying isotopes. Element 147 is discussed within predictions about stability at extreme atomic numbers.
International Union of Pure and Applied Chemistry: The international organization that standardizes chemical nomenclature, terminology, and measurement conventions. IUPAC assigns temporary systematic names and approves permanent names for new elements.
Relativistic quantum chemistry: The study of chemical structure and behavior when relativistic effects significantly alter electronic motion. At very high nuclear charge, relativistic effects complicate predictions of element 147's chemistry.
Periodic table: A tabular arrangement of chemical elements ordered by atomic number and recurring properties. Element 147 would extend the table beyond all currently recognized elements.
Radioactive decay: The spontaneous transformation of an unstable atomic nucleus into a different nucleus or particles. Any produced isotope of element 147 would be identified partly through its decay.