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Radon
Radon

Radon

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The gaseous element radon (Rn) gets attention largely because it's radioactive. Radon is the heaviest and only radioactive member of the group of elements called the noble or inert gases....
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Ages: 11-12
Read time: 45-60 mins
AR LEVEL: 7.5+
LEXILE©: 1240L
Ages: 11-12
Read time: 45-60 mins

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