Oliver Wolcott Gibbs
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Heinrich Rose
Karl Friedrich August Rammelsberg
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Albrecht von Graefe (ophthalmologist)
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Wilhelm Karl Ritter von Haidinger
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Group 5 element
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Christian Gottfried Ehrenberg
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Period 5 element
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William Hyde Wollaston
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Charles Hatchett
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Rare-earth element
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Niobe
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Tantalum
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Technetium
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Samarium
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Niobium
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Timeline of chemical element discoveries
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