Name a group 18 chemical element.
Use the modern periodic table. Oganesson counts by its group position, regardless of its predicted properties.
Group 18 has seven elements. Oganesson is included by its position in the table, not by an assumption that all its properties match lighter noble gases.
Reveal all 7 checked answers and scores
Points are editorial tiers. The source supports membership in the set, not how many people know an answer.
- Helium 25 · Familiar
- Helium is in the 7-answer set defined by this question.
- Neon 25 · Familiar
- Neon is in the 7-answer set defined by this question.
- Argon 50 · Less common
- Argon is in the 7-answer set defined by this question.
- Krypton 75 · Uncommon
- Krypton is in the 7-answer set defined by this question.
- Xenon 75 · Uncommon
- Xenon is in the 7-answer set defined by this question.
- Radon 100 · Rare
- Radon is in the 7-answer set defined by this question.
- Oganesson 100 · Rare
- Oganesson is in the 7-answer set defined by this question.
Checked exclusions
- Hydrogen: Hydrogen is not a group 18 element.
- Nitrogen: Nitrogen is not a group 18 element.
Sources for this question
- ELEMENTS
Group 18 column includes seven elements including Og; classification, not inferred physical properties.
pubchem.ncbi.nlm.nih.gov · Checked 2026-11-02
- Noble gas
Group 18 column includes seven elements including Og; classification, not inferred physical properties.
en.wikipedia.org · Checked 2026-11-02
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