Pelopium
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Jean Charles Galissard de Marignac
Ytterbium(III) oxide
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Marc Delafontaine
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Group 5 element
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Phthalic acid
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Prout's hypothesis
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Group 3 element
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Paul-Émile Lecoq de Boisbaudran
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Rare-earth element
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List of chemists
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1817
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Ytterbium
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Tantalum
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Niobium
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Lutetium
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Gadolinium
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Timeline of chemical element discoveries
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Jean-Charles-Galinard de Marignac
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