These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.Discoverer: Coster, Dirk and De Hevesy, George Charles,Discoverer: Elhuyar, Juan José and Elhuyar, Fausto,Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida.Discoverer: Corson, Dale R. and Mackenzie, K. R.The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars.Mercury is commonly known as quicksilver and was formerly named hydrargyrum. Our.The information contained in this website is for general information purposes only. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.Sodium is a soft, silvery-white, highly reactive metal. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.Discoverer: Coster, Dirk and De Hevesy, George Charles,Discoverer: Elhuyar, Juan José and Elhuyar, Fausto,Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida.Discoverer: Corson, Dale R. and Mackenzie, K. R.The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry.Main purpose of this project is to help the public learn some interesting and important information about chemical elements,Our Website follows all legal requirements to protect your privacy. Major advantage of lead shield is in its compactness due to its higher density. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. In 1815, the Swedish chemist Jöns Jacob Berzelius analysed an unusual sample of gadolinite from a copper mine in Falun, central Sweden. Lead is soft and malleable, and has a relatively low melting point. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral).Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids.Uranium is a silvery-white metal in the actinide series of the periodic table. Its extreme rarity in the Earth’s crust, comparable to that of platinum.Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. In fact their absorption cross-sections are the highest among all stable isotopes.Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. A freshly exposed surface of pure copper has a reddish-orange color. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air.Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically.Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”.Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite.Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles.Lawrencium is the final member of the actinide series. In the periodic table, potassium is one of the alkali metals. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite.Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Uranium has the highest atomic weight of the primordially occurring elements. Its properties are thus intermediate between those of chlorine and iodine.Krypton is a member of group 18 (noble gases) elements. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. It is the fourth most common element in the Earth’s crust. It is even less abundant than the so-called rare earths. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony.Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth.Astatine is the rarest naturally occurring element on the Earth’s crust.

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