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27 March, 14:59

What was discovered first helium or samarium?

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  1. 27 March, 15:09
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    The correct answer is helium, but both discoveries were quite close. Helium was discovered in 1868 during a solar eclipse by French astronomer Jules Janssen, while samarium was discovered in 1879 by a French chemist Paul Émile Lecoq de Boisbaudran.
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