character: Radium
topic: Chemical Reactions involving Radioactive Elements
grade: 9
subject: Chemistry
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character: Uranium
topic: Fission reactions and properties of radioactive elements
grade: 9
subject: Chemistry
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character: Polonium
topic: Alpha decay and chemical behavior of radioactive materials
grade: 9
subject: Chemistry
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character: Radon
topic: Noble gases and their radioactive isotopes
grade: 9
subject: Chemistry
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