Sub-topic 1
2026 · National Preliminary
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Noble gases (group 18): reactivity trends and stability of known compounds
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Sub-topic 2
2026 · National Preliminary
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Periodic trends in melting point and intermolecular forces down group 17 (true/false)
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Sub-topic 3
2024 · National One-Eighth
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Properties of alkali metals: melting point, atomic radius and reactivity trends (true/false)
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Sub-topic 4
2020 · National One-Eighth
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Riddle: calcium nitrate, a soluble salt of a reactive group 2 metal
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