Science / Periodic Table of Elements / Ytterbium (Yb): Atomic number: 70, Atomic mass: 173.04 g.mol -1, Electronegativity: 1.1, Density: 7 g.cm-3 at 20°C, Melting point: 824 °C, Boiling point: 1466 °C, Vanderwaals radius: unknown, Ionic radius: unknown, Isotopes: 9, Electronic shell: [ Xe ] 4f14 6s2, Energy of second ionisation: 602.4 kJ.mol -1, Energy of second ionisation: 1172.3 kJ.mol -1, Energy of third ionisation: 2472.3 kJ.mol -1, Standard potential: - 2.27 V, Discovered by: Jean de Marignac in 1878. Ytterbium is a soft, malleable and rather ductile element that exhibits a bright silvery luster. A rare earth, the element is easily attacked and dissolved by mineral acids, slowly reacts with water, and oxidizes in air. The oxide forms a protective layer on the surface. Compounds of ytterbium are rare. Applications: Ytterbium is sometimes associated with yttrium or other related elements and is used in certain steels. Its metal could be used to help improve the grain refinement, strength, and other mechanical properties of stainless steel. Some ytterbium alloys have been used in dentistry. One ytterbium isotope has been used as a radiation source substitute for a portable X-ray machine when electricity was not available. Like other rare-earth elements, it can be used to dope phosphors, or for ceramic capacitors and other electronic devices, and it can even act as an industrial catalyst. Ytterbium in the environment: Ytterbium is found with other rare earth elements in several rare minerals as gadolinite, monazite, and xenotime. Natural ytterbium is a mix of seven stable isotopes. It is most often recovered commercially from monazite sand (~0.03% ytterbium). The main mining areas are China, US, Brazil, India, Sri Lanka, and Australia and reserves of ytterbium are estimated to be around a million tonnes. World production of ytterbium is around 50 tonnes per year.
Science / Periodic Table of Elements / Ytterbium (Yb): Atomic number: 70, Atomic mass: 173.04 g.mol -1, Electronegativity: 1.1, Density: 7 g.cm-3 at 20°C, Melting point: 824 °C, Boiling point: 1466 °C, Vanderwaals radius: unknown, Ionic radius: unknown MORE