Helium, the 'most noble' of the noble gases, had only been coaxed into forming molecular ions or van der Waals compounds. It has now been seen in a stable solid compound, Na2He, under high pressure.
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Miao, M. React with nobility. Nature Chem 9, 409–410 (2017). https://doi.org/10.1038/nchem.2768
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DOI: https://doi.org/10.1038/nchem.2768
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