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Thulium is the thirteenth and third-last element in the lanthanide series.Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides.Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. 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. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table.Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements.Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Dubnium is a chemical element with atomic number 105 which means there are 105 protons and 105 electrons in the atomic structure. 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. It is the heaviest essential mineral nutrient.Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. The forces of chemical bonding causes this repetition. Connelly, Neil G., Ture Damhus, Richard M. Hartshorn, and Alan T. Hutton.Ghiorso, A., B. G. Harvey, G. R. Choppin, S. G. Thompson, and G. T. Seaborg. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications.Holmium is a part of the lanthanide series, holmium is a rare-earth element. Lead is widely used as a gamma shield. When an electron is added to a neutral atom, energy is released. ",Ghiorso, Albert, Torbjørn Sikkeland, Almon E. Larsh, and Robert M. Latimer. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite.Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. It is one of the least reactive chemical elements and is solid under standard conditions. Name: Dubnium Symbol: Db Atomic Number: 105 Atomic Mass: (262.0) amu Melting Point: Unknown Boiling Point: Unknown Number of Protons/Electrons: 105 Number of Neutrons: 157 Classification: Transition Metal Crystal Structure: Unknown Density @ 293 K: Unknown Color: Unknown Other Names: Unnilpentium (Unp), Joliotium (Jl), Hahnium (Ha) Atomic Structure This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium.Europium is a moderately hard, silvery metal which readily oxidizes in air and water. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine.Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium).Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant.Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant.Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. 113Cd has specific absorption cross-section.Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps.Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678.

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