Licensed under Free Art License Alchemist-hp talk www. Lutetium is a chemical element with symbol Lu and atomic number It is a silvery white metal , which resists corrosion in dry air, but not in moist air. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Lutetium is sometimes considered the first element of the 6th-period transition metals , although lanthanum is more often considered as such.
Facts About Hafnium
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Naturally occurring lutetium 71 Lu is composed of one stable isotope Lu Thirty-four radioisotopes have been characterized, with the most stable, besides Lu, being Lu with a half-life of 3. All of the remaining radioactive isotopes have half-lives that are less than 9 days, and the majority of these have half-lives that are less than half an hour. The isotopes of lutetium range in atomic weight from The primary decay mode before the most abundant stable isotope, Lu, is electron capture with some alpha and positron emission , and the primary mode after is beta emission. The primary decay products before Lu are isotopes of ytterbium and the primary products after are isotopes of hafnium.
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Front Cover. Hafnium is a shiny, silvery, ductile metal that is corrosion -resistant and chemically similar to zirconium  due to its having the same number of valence electronsbeing in the same group, but also to relativistic effects ; the expected expansion of atomic radii from period 5 to 6 is almost exactly cancelled out by the lanthanide contraction. Dirk Coster and George de Hevesy Cookies come in two flavours — persistent and transient.
Hafnium is a chemical element with the symbol Hf and atomic number A lustrous , silvery gray, tetravalent transition metal , hafnium chemically resembles zirconium and is found in many zirconium minerals. Its existence was predicted by Dmitri Mendeleev in , though it was not identified until , by Coster and Hevesy, making it the last stable element to be discovered.