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Colourless Gas Atomic Number 86 Crossword Clue

There is 1 exact and 118 possible answers.
We've checked our database and believe the answer is RADON which was last seen in the The Guardian Quick crossword.
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We think the answer to this crossword clue is: RADON

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99%5Exact Match!
noun

• a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health

46%9Colourless salt used in analytical chemistry
No meanings yet for this word...
35%5 First noble gas to be discovered and isolated, atomic number 18
noun

• a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere

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Clue Last Found In...

Source #Number Answer
The Guardian Quick12 Feb 2015 Across 20
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