radon - WordReference.com Dictionary of English

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radon

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Concise Oxford English Dictionary © 2008 Oxford University Press:
radon /ˈreɪdɒn/

▶noun the chemical element of atomic number 86, a rare radioactive noble gas. (Symbol: Rn)

– origin early 20th cent.: from radium (from which it is formed by radioactive decay), on the pattern of argon.

'radon' also found in these Oxford entries:

noble gas - occur - Rn

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