Sub-topic 1
2025 · National Preliminary
Free
Classifying elements as main group metal, transition metal, metalloid or transuranium
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Sub-topic 2
2013 · National Quarterfinal
Premium
True or false: diamond and silicon are metalloids or non-metals
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Sub-topic 3
2023 · National Preliminary
Premium
True or false: physical/chemical properties and states of allotropes
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