Europium (Eu)

Science / Periodic Table of Elements / Europium (Eu): Atomic number: 63, Atomic mass: 167.26 g.mol -1, Electronegativity: 1.2, Density: 9.2 g.cm-3 at 20°C, Melting point: 1522 °C, Boiling point: 2510 °C, Vanderwaals radius: unknown, Ionic radius: unknown, Isotopes: 9, Electronic shell: [ Xe ] 4f12 6s2, Energy of first ionisation: 587.6 kJ.mol -1, Energy of second ionisation: 1149 kJ.mol -1, Standard potential: - 2.30 V, Discovered by: Carl Mosander in 1843. Europium is a soft silvery metal, both are and expensive. It is the most reactive of the lanthanide group: it tarnishes quickly in air at room temperature, burns at about 150 C to 180 C and reacts readly with water. Applications: Europium is a neutron adsorber, , so it is used in nuclear reactors control rods. Europium phosphors are used in television tubes to give a bright red colour and as an activator for yttrium-based phosphors. For powerful street lighting a little europium is added to mercury vapour lamps to give a more natural light. A salt of europium is used for newer phosphorescent powder and paints. Europium in the environment: Europium is one of the less abundant rare-earth elements: it is almost as abundant as tin. It is never found in nature as the free element, but there are many elements containing eruropium. Main mining areas are China and USA. Reserves of europium are estimated to be around 150.000 tonnes and world production of the pure metal is around 100 tonnes a year.

Europium (Eu)

Science / Periodic Table of Elements / Europium (Eu): Atomic number: 63, Atomic mass: 167.26 g.mol -1, Electronegativity: 1.2, Density: 9.2 g.cm-3 at 20°C, Melting point: 1522 °C, Boiling point: 2510 °C, Vanderwaals radius: unknown, Ionic radius: unkn MORE

European Union (EU)

Business / Agriculture / European Union (EU): Since 1993, the term used to describe the European Community and related institutions. The entry into force of the Maastricht Treaty of European Union on November 1, 1993, introduced this change in te MORE

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