Símbolo | Lu |
Número atómico | 71 |
Grupo | - |
Período | 6 |
Bloque | f |
Clasificación | Lantánidos |
Apariencia | Silvery white |
Color | Plata |
Número de protones | 71 p+ |
Número de neutrones | 104 n0 |
Número de electrones | 71 e- |
Fase en STP | Sólido |
Densidad | 9.841 g/cm3 |
Peso atómico | 174.967 u |
Punto de fusión | 1925 K 1651.85 °C 3005.33 °F |
Punto de ebullición | 3675 K 3401.85 °C 6155.33 °F |
Entalpía de vaporización | 355 kJ/mol |
Electronegatividad (Escala de Pauling) | 1.27 |
Afinidad electrónica | 33.4 kJ/mol |
Estado de oxidación | 0, +1, +2, +3 (a weakly basic oxide) |
Energía de ionización |
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Descubrimiento | Carl Auer von Welsbach, Georges Urbain (1906) |
Primer aislamiento | Carl Auer von Welsbach (1906) |
Nombrado por | Georges Urbain (1906) |
Descubrimiento de lutecio Lutetium was independently discovered in 1907 by French scientist Georges Urbain, Austrian mineralogist Baron Carl Auer von Welsbach, and American chemist Charles James. All of these researchers found lutetium as an impurity in the mineral ytterbia, which was previously thought to consist entirely of ytterbium. The dispute on the priority of the discovery occurred shortly after, with Urbain and Welsbach accusing each other of publishing results influenced by the published research of the other; the naming honor went to Urbain, as he had published his results earlier. He chose the name lutecium for the new element, but in 1949 the spelling was changed to lutetium. In 1909, the priority was finally granted to Urbain and his names were adopted as official ones; however, the name cassiopeium (or later cassiopium) for element 71 proposed by Welsbach was used by many German scientists until the 1950s. |