Sigauquium Sq-126: A Proposed Name and Synthesis Target for Element 126, Prioritizing the 324Sq Isotope and a Low-Cost Natural Search in Mozambican Monazite

Element 126 (temporary IUPAC name: unbihexium, Ubh) has not yet been synthesized. This preprint registers an original, dated proposal by Junior Sigauque (VoltTech, Mozambique): if element 126 is discovered, the proposed permanent name is Sigauquium (Portuguese: Sigauquio), with proposed symbol Sq — a name and symbol verified free of prior use in web searches (PT/EN, 27 Oct 2026). The proposal prioritizes the 324Sq isotope (N=198) over the classic doubly magic 310 target, based on recent nuclear models, and includes a low-cost plan: a natural search for primordial element 126 in monazite from Mozambican heavy mineral sands using fission-track detectors and accelerator mass spectrometry via academic collaboration, targeting mass numbers 324/354 not covered by previous AMS searches (A=288-300), plus synthesis only through approved beam time with abundant reaction partners such as 238U + 82Se. HONEST STATUS: this is a dated name-and-strategy proposal. Element 126 has NOT been synthesized by the author or by anyone else, and this deposit is NOT a recognized discovery claim under IUPAC/IUPAP rules; naming rights belong to the future discoverers.