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The element with IUPAC temporary symbol 'Uuo' (atomic number 118) belongs to which of the following categories?

1. Actinide
2. Lanthanide
3. Coinage metal
4. None of these

Correct answer: None of these

Solution

Oganesson (Uuo, Z=118) occupies Group 18 of Period 7, making it a p-block noble gas. Lanthanides are elements 57-71 (f-block, Period 6), actinides are 89-103 (f-block, Period 7), and coinage metals are Cu, Ag, Au (Group 11). Uuo fits none of these categories.

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