Untribium

Untribium is the temporary systematic name assigned to hypothetical chemical element 123, with the provisional symbol Ubt. No confirmed discovery or synthesis of the element has been reported.

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Element 123: Element 123 is the hypothetical chemical element with atomic number 123. Untribium is the systematic name assigned to this still-undiscovered element.
Island of stability: The island of stability is a predicted region of enhanced nuclear stability among superheavy isotopes. It motivates estimates of whether any untribium isotope could persist long enough to study.
IUPAC element discovery criteria: IUPAC element discovery criteria are standards for recognizing a claimed new chemical element. They explain why a systematic placeholder does not establish that untribium has been discovered.
Synthesis of superheavy elements: Synthesis of superheavy elements uses nuclear reactions to create atoms with very high atomic numbers. Producing untribium would require a suitable reaction and detection of its short-lived atoms.
IUPAC systematic element name: An IUPAC systematic element name encodes an element's atomic number using numerical roots and a standard suffix. Untribium follows this naming scheme because element 123 has no approved permanent name.
Superheavy element: A superheavy element is a chemical element with a very high atomic number, generally above 103. Element 123 would belong to the superheavy elements, whose nuclei are difficult to create and stabilize.
Transfermium Wars: The Transfermium Wars were disputes over discovery claims and naming rights for elements 104 through 106. Those contested claims contrast with element 123's lack of an accepted discovery claim.
Nuclear fusion: Nuclear fusion joins atomic nuclei, sometimes producing a heavier nucleus and emitted particles. Fusion reactions are the principal route considered for making heavier elements such as element 123.
IUPAC element naming: IUPAC element naming assigns official names and symbols to chemical elements. IUPAC's temporary naming rules produce the name and symbol Ubt.
Nuclear shell model: The nuclear shell model describes protons and neutrons as occupying quantized energy levels in a nucleus. Shell effects are central to predictions about the stability of untribium's possible isotopes.