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lutetium

World Encyclopedia

lutetium (symbol Lu) Metallic element of the lanthanide series, isolated in 1907 from the element ytterbium. Chief ore is monazite (phosphate). It is used in the cracking of petroleum. It was named after the Latin name for Paris (Lutetia) by French chemist Georges Urbain who discovered it. Properties: at.no. 71; r.a.m. 174.97; r.d. 9.835; m.p. 1656°C (3013°F); b.p. 3315°C (5999°F); most common isotope Lu¹⁷⁵ (97.41%).

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© World Encyclopedia 2005, originally published by Oxford University Press 2005.

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