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18 hours ago · Iridium is a chemical element; it has symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of 22.56 g/cm 3 (0.815 lb/cu in) [8] as defined by experimental X-ray crystallography. [a] 191 Ir and 193 Ir ...
1 day ago · Ozone ( / ˈoʊzoʊn /) (or trioxygen) is an inorganic molecule with the chemical formula O. 3. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O. 2, breaking down in the lower atmosphere to O.
5 days ago · Hence, the products formed when sodium hydroxide reacts with nitric acid are sodium nitrate and water respectively. The sodium ions and the nitrate ions are called spectator in this reaction as they do not participate actively in the reaction. They only form an ionic product, while the proton and the hydroxide ion combine to form water.
3 days ago · Polonium is a radioactive element that exists in two metallic allotropes. The alpha form is the only known example of a simple cubic crystal structure in a single atom basis at STP ( space group Pm 3 m, no. 221). The unit cell has an edge length of 335.2 picometers; the beta form is rhombohedral. [8] [9] [10] The structure of polonium has been ...
1 day ago · The pH of a sodium fluoride solution can be calculated using the dissociation constant of the fluoride ion and the pH definition. Sodium fluoride is a compound that dissociates in water to form fluoride ions, which can react with water to form a small amount of hydrofluoric acid and hydroxide ions, affecting the pH of the solution.
