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If it is 'never found in nature' that means it's a large and radioactive atom so it will be in the lower parts of the periodic table. Non metals are to be found in the upper right hand side of the Periodic Table and become metallic roughly across a diagonal between boron and polonium. So the one you want can only be polonium, astatine or radon. Well polonium is really a metalloid rather than a true non-metal and it does occur in various radioactive rocks. When we check out radium we find that it's a nasty carcinogenic gas that occurs in nature when radium or uranium atoms decay; it's natural so we must be looking at astatine. Sure enough,Wikipedia tells us; '...a mass (of astatine) large enough to be seen (by the naked human eye) would be immediately vaporized by the heat generated by its own radioactivity'.

Astatine it is!

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