How are the risks of Radon known if it’s so unstable that an accurate molecular weight is still unknown?
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We know the isotopic mass of Radon-222, the most stable isotope. It’s 222.0175763 Da.
What we don’t have is a *standard* atomic weight, because that requires averaging the masses of the known isotopes weighted according to their abundance on Earth, and with a few exceptions (Bismuth, Thorium, Uranium, etc.) we can’t calculate that for elements whose isotopes are *all* radioactive.
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