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Roentgenium, RG, 111, formerly known as Unununium, is a synthetic element. The most stable isotope has a mass of 280. This isotope has a half-life of 3.6 seconds. Due to the fact that it is highly radioactive, but moreso because it decays so quickly, it exists only in the lab. You would not be able to keep it around long enough to sell it.

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16y ago

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