Unpenttrium

Unpenttrium is the temporary systematic name for the hypothetical chemical element with atomic number 153, constructed from the digits of its atomic number.

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IUPAC systematic element name: A provisional element name formed from numerical roots for each digit of its atomic number, followed by the suffix -ium. Unpenttrium is built from the systematic roots for 1, 5, and 3.
Extended periodic table: A proposed continuation of the periodic table beyond the elements currently confirmed. Unpenttrium appears in predictions of elements beyond the known table.
Extended periodic table, seventh period: A proposed continuation of period seven that includes elements beyond oganesson. Predicted placements for element 153 depend on how the table is extended.
Element naming: The process by which chemical elements receive names and symbols under international conventions. Unpenttrium illustrates the provisional stage before an official element name is adopted.
Atomic number: The number of protons in an atomic nucleus, which identifies a chemical element. The value 153 determines both the proposed element's identity and its temporary name.
Island of stability: A predicted region of relatively long-lived superheavy nuclides among otherwise short-lived nuclei. Nuclear models ask whether isotopes near this atomic number could gain extra stability.
Relativistic quantum chemistry: The study of chemical structure and behavior when relativistic effects significantly alter electrons. Relativistic effects would strongly influence the orbitals and chemistry of such a heavy element.
Nihonium: The chemical element with atomic number 113, officially named after its discovery was confirmed. Its permanent name replaced the temporary systematic name ununtrium.
Chemical element: A pure substance whose atoms all have the same number of protons. Unpenttrium would be a distinct element if atoms with 153 protons were established.
Nuclear shell model: A model of the nucleus in which protons and neutrons occupy quantized energy levels. Shell structure helps estimate whether a nucleus with 153 protons can exist.