Holmium ist ein chemisches Element mit dem. 1 Holmium ist ein chemisches Element mit dem Elementsymbol Ho und der Ordnungszahl Im Periodensystem steht es in der Gruppe der Lanthanoide und zählt damit auch zu den Metallen der Seltenen Erden. 2 Holmium ist ein Reinelement. In der Natur kommt nur das Isotop Ho vor. Es ist ein dehnbares, silberweißes Schwermetall ( Element der Gruppe der. 3 Holmium - chemisches Zeichen Ho, Ordnungszahl 67 - ist ein silberweißes, duktiles, form- und schmiedbares, hexagonal kristallisierendes. 4 Holmium is a lanthanoid (4f) element and its preferred oxidation state is +3, as in its oxide Ho2O3and in HoF3. In solution it exists as [Ho(H2O)9]3+ions. Topics Elements and the periodic table Isotopes Natural resources Nuclear chemistry and radioactivity Spectrometry No comments Related articles Feature How to read the periodic table. 5 Holmium is a rare-earth element with the periodic table symbol (Ho), atomic number 67, atomic mass of -1, and electron configuration [Xe] 4fs2. It comprises a lanthanoid atom and an f-block element atom. This chemical element is a soft, malleable, and lustrous metal with strong magnetic properties. 6 Holmium is a bright, soft, silvery-white, rare earth metal that is both ductile and malleable. It does not react in dry air at normal temperatures, but rapidly oxidizes to a yellow oxide (Ho 2 O 3) in moist air or when heated. When present in compounds, holmium exists usually in the trivalent state, Ho 3+. 7 Holmium's chemical similarity to its neighbouring elements made it difficult to discover; today this similarity often leads to few compelling reasons to select it for a given purpose from a. 8 Holmium (Ho) is a silver, rare earth metal, with the atomic number 67 and present in the 6th row, f-block of the periodic table. The element is categorized under the lanthanides. It has unusual electrical and magnetic properties and is used in nuclear reactors for its good absorption power. 9 Holmium has 30 isotopes with mass numbers ranging from Ho to Ho out of which Ho is a naturally-occurring stable isotope. The most stable isotope is Ho with a half-life of years. Production Pure holmium can be obtained through the reduction of holmium fluoride with calcium metal. 2HoF 3 + 3Ca → 2Ho + 3CaF 2. holmium homöopathie 10 holmium preis 12