Europium - 1901 [Eu63]
Lanthan - 1898 [La57]
Ytterbium - 1878 [Yb70]
Praseodym - 1885 [Pr59]
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Metalle der Seltenen Erden - Rare Earth Elements (Pt.2)
Metalle der Seltenen Erden - Rare Earth Elements (Pt.2)
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Metalle der Seltenen Erden - Rare Earth Elements (Pt.2)
A series of chemical elements with unique magnetic, luminescent, and electrochemical properties. - Nathanael Noir
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