Question

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Which is Noble element whose atomic number is 86 ??

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Answer 1

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Radon is Noble element whose atomic number 86

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Answer 2

Noble element whose atomic number 86 was Radon

Explain

It is chemically inert, but radioactive. Radon decays into radioactive polonium and alpha particles. This emitted radiation made radon useful in cancer therapy. Radon was used in some hospitals to treat tumours by sealing the gas in minute tubes, and implanting these into the tumour, treating the disease in situ.