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Osmium (from Ancient Greek ὀσμή (osmḗ) 'smell') is a chemical element; it has symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element.
Osmium dioxide is another known oxide of osmium, which can be obtained by the reaction of osmium with a variety of oxidizing agents, including, sodium chlorate, osmium tetroxide, and nitric oxide at about 600 °C. [18] [19] It does not dissolve in water, but is attacked by dilute hydrochloric acid. [20] [21] The crystals have rutile structure. [22]
Iron is a part of some hormones as well. A lack of iron in the body can cause iron deficiency anemia, and an excess of iron in the body can be toxic. [7] Some ruthenium-containing molecules may be used to fight cancer. [8] Normally, however, ruthenium plays no role in the human body. [3] Both osmium and hassium have no known biological roles ...
The osmium of OsO 4 has an oxidation number of VIII; however, the metal does not possess a corresponding 8+ charge as the bonding in the compound is largely covalent in character (the ionization energy required to produce a formal 8+ charge also far exceeds the energies available in normal chemical reactions). The osmium atom exhibits double ...
osmium: 76: 1a: None known. [11] Osmium is very rare, substantially more so than any element essential to life. [3] The oxide is toxic to humans. [11] oxygen: 8: 5: Ubiquitous, essential for all forms of life; essentially all biological molecules (not to mention water) contain substantial amounts of oxygen. [11] In high concentrations, oxygen ...
Potassium ferricyanide (K 3 Fe(CN) 6) is the most commonly used stoichiometric oxidant for the reaction, and is the oxidant that comes in the commercially available AD-mix preparations. Additive: Citric acid: Osmium tetroxide is an electrophilic oxidant and as such reacts slowly with electron-deficient olefins.
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What was claimed to be osmium(IV) iodide was produced by the reaction of osmic acid (OsO 2 •2H 2 O) and hydroiodic acid. [4] However on attempted reproduction, this substance was found to be dihydroxonium hexaiodoosmate ((H 3 O +) 2 OsI 6 2–). When heated this did not form a tetraiodo compound, and instead formed mono, di, and tri-iodo ...