Electrons in one particular solid phase of plutonium are complex characters: while bound to atoms, in a quantum-mechanical mixture of two different valence states, they also roam freely throughout the crystal.
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Albers, R., Zhu, JX. Vacillating valence. Nature 446, 504–505 (2007). https://doi.org/10.1038/446504b
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DOI: https://doi.org/10.1038/446504b
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