Símbolo | Er |
Número atómico | 68 |
Grupo | - |
Período | 6 |
Bloque | f |
Clasificación | Lantánidos |
Apariencia | Silvery white |
Color | Plata |
Número de protones | 68 p+ |
Número de neutrones | 99 n0 |
Número de electrones | 68 e- |
Fase en STP | Sólido |
Densidad | 9.066 g/cm3 |
Peso atómico | 167.259 u |
Punto de fusión | 1802 K 1528.85 °C 2783.93 °F |
Punto de ebullición | 3141 K 2867.85 °C 5194.13 °F |
Entalpía de vaporización | 292.88 kJ/mol |
Electronegatividad (Escala de Pauling) | 1.24 |
Afinidad electrónica | 30.1 kJ/mol |
Estado de oxidación | 0, +1, +2, +3 (a basic oxide) |
Energía de ionización |
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Descubrimiento | Carl Gustaf Mosander (1843) |
Descubrimiento de erbio Erbium (for Ytterby, a village in Sweden) was discovered by Carl Gustaf Mosander in 1843. Mosander was working with a sample of what was thought to be the single metal oxide yttria, derived from the mineral gadolinite. He discovered that the sample contained at least two metal oxides in addition to pure yttria, which he named "erbia" and "terbia" after the village of Ytterby where the gadolinite had been found. Mosander was not certain of the purity of the oxides and later tests confirmed his uncertainty. Not only did the "yttria" contain yttrium, erbium, and terbium; in the ensuing years, chemists, geologists and spectroscopists discovered five additional elements: ytterbium, scandium, thulium, holmium, and gadolinium. |