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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 the periodic table, potassium is one of the alkali metals.

By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium.Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis.Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust.Radon is a radioactive, colorless, odorless, tasteless noble gas. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). X-ray Diffraction- different compounds of Berkelium metals are identified using it. Silver † Samantha K. Cary † Alejandro J. Garza ‡ Ryan E. Baumbach Alexandra A. Arico † Gregory A. Galmin † Kuan-Wen Chen Jason A. Johnson ∥ Jamie C The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation.Lawrencium is the final member of the actinide series. There are 14 general types of such patterns known as Bravais lattices.Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant.Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. What is Berkelium - Chemical Properties of Berkelium - Symbol Bk. Chemically, indium is similar to gallium and thallium.Typical densities of various substances are at atmospheric pressure.Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite.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.Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor.Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry.The current IUPAC Gold Book definition of oxidation state is:In metals, and in many other solids, the atoms are arranged in regular arrays called crystals. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals.Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium).Sulfur is abundant, multivalent, and nonmetallic.