Erbium(Er) is one of the lanthanide elements with an atomic number 68. Erbium is a bright, soft silvery white rare earth metal that slowly tarnishes in air and slowly reacts with water. Erbium dissolve in acids. Mostly in compounds erbium presents in its trivalent state(Er 3+ ). Pure erbium is metal that can be easily shaped meaning that it is a malleable chemical element. Erbium has no biological role, but there are thoughts that it is able to stimulate metabolism. As a chemical property, erbium is little electropositive element that reacts with water to form erbium hydroxide. In addition, erbium reacts with all halogens. In acids erbium exists as hydrated erbium([Er(OH 2 ) 9 ] 3+ ) which has a rose red color. Erbium was discovered by Swedish chemist Carl GustafMosander in 1843 together with another rare earth metal called ytterbium in Swedish village called Ytterby. However, the pure erbium was produce only in 1934 by W. Klemm and H. Bommer by reducing its anhydrous chloride with ...
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