character: Radon
topic: Properties and Uses of Noble Gases
grade: 9
subject: Chemistry
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character: Noble Gases
topic: Chemical Properties and Applications
grade: 9
subject: Chemistry
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character: Radon-222
topic: Radioactive Isotopes of Noble Gases
grade: 9
subject: Chemistry
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character: Xenon
topic: Comparison of Noble Gases and Their Isotopes
grade: 9
subject: Chemistry
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