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| Radon is classified group 18, the group of noble gases, and is in period 6. The most stable isotope is radon-222 which will exist for 3.4 days before decaying into polonium-218 through Alpha decay. | |
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| Are there other isotopes? | |
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| Yeah, there is also 219, 220, and 226. | |
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| Thanks for explaining, but how do I test for radon? | |
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| You should probably hire a professional. | |
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