What is the officially recognized IUPAC nomenclature for the element with atomic number ? — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

According to the IUPAC rules for naming elements with $Z > 100$, the roots for the digits are: 1 = un, 0 = nil, 5 = pent. Adding the suffix '-ium' gives 'Un-nil-pent-ium' $\rightarrow$ Unnilpentium.