Unbiseptium

Unbiseptium is the temporary systematic name assigned to the hypothetical chemical element with atomic number 127. No element with this atomic number has been confirmed.

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Atomic number: The number of protons in an atom’s nucleus, which defines its chemical element. The value 127 identifies the hypothetical element called unbiseptium.
Superheavy element: A chemical element with an atomic number above 103, whose nuclei are typically highly unstable. Element 127 would belong to the superheavy elements if produced.
IUPAC systematic element naming: The IUPAC procedure for assigning temporary names and symbols to elements by atomic number. It generates unbiseptium from the digits of atomic number 127.
Transfermium experiments: Experiments that synthesize and identify elements with atomic numbers above 100 using nuclear reactions. Their methods would underpin any attempt to produce element 127.
Periodic table: A tabular arrangement of chemical elements ordered by atomic number and grouped by recurring properties. Element 127 would extend the table beyond all currently confirmed elements.
Nuclear fusion: A nuclear reaction in which atomic nuclei combine to form a heavier nucleus. Synthesis attempts would need to fuse projectile and target nuclei into element 127.
Element 118: Oganesson is the confirmed chemical element with atomic number 118, the heaviest officially recognized element. Its confirmed discovery contrasts with the hypothetical status of element 127.
Nuclear shell model: A model of atomic nuclei that explains structure through energy levels occupied by protons and neutrons. Predicted shell closures affect estimates of stability for extremely heavy nuclei.
Systematic element name: A temporary name formed by translating an element’s atomic number into numerical roots and adding the suffix -ium. Unbiseptium encodes the digits of 127 using the IUPAC naming convention.
Heavy-ion accelerator: A machine that accelerates atomic nuclei to high energies for nuclear physics experiments. Accelerator beams provide the energetic projectiles used in superheavy-element searches.