Adrian Dingle relates how one ‘element’ that fell off the periodic table was eventually replaced by two.
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Dingle, A. Praseodymium unpaired. Nature Chem 10, 576 (2018). https://doi.org/10.1038/s41557-018-0050-7
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DOI: https://doi.org/10.1038/s41557-018-0050-7