The IUPAC name of an element with atomic number 119 is

1. ununoctium

2. ununennium

3. unnilennium

4. unununnium

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Answer: 2. ununennium

Key idea: IUPAC temporary names use numerical roots: 0 = nil, 1 = un, 9 = enn, ending in -ium.

Z = 119 means digits 1, 1, 9 = un + un + enn + ium = ununennium (symbol Uue).

Ununoctium is Z = 118, unnilennium is not a valid name for 119 (it would be 1-0-9), and unununnium is Z = 111.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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