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Group 7, numbered by IUPAC nomenclature, is a group of elements in the periodic table. It contains manganese (Mn), technetium (Tc), rhenium (Re) and bohrium (Bh). This group lies in the d-block of the periodic table, and are hence transition metals. This group is sometimes called the manganese group or manganese family after its lightest member ...
Manganese (VII) oxide (manganese heptoxide) is an inorganic compound with the formula Mn 2 O 7. Manganese heptoxide is a volatile liquid with an oily consistency. It is a highly reactive and powerful oxidizer that reacts explosively with nearly any organic compound. It was first described in 1860. [1] It is the acid anhydride of permanganic acid.
Oxidation states are typically represented by integers which may be positive, zero, or negative. In some cases, the average oxidation state of an element is a fraction, such as 8 / 3 for iron in magnetite Fe 3 O 4 . The highest known oxidation state is reported to be +9, displayed by iridium in the tetroxoiridium(IX) cation (IrO + 4). [1]
A permanganate (/ pərˈmæŋɡəneɪt, pɜːr -/) [1] is a chemical compound with the manganate (VII) ion, MnO−. 4, the conjugate base of permanganic acid. Because the manganese atom has a +7 oxidation state, the permanganate (VII) ion is a strong oxidising agent. The ion is a transition metal ion with a tetrahedral structure. [2]
4 Tc + 7 O 2 → 2 Tc 2 O 7. It is a molecular metal oxide, analogous to manganese heptoxide. It adopts a centrosymmetric structure with two types of Tc−O bonds with 167 and 184 pm bond lengths. [3] Technetium heptoxide hydrolyzes to pertechnetate and pertechnetic acid, depending on the pH: [4] [5] Tc 2 O 7 + 2 OH − → 2 TcO 4 − + H 2 O ...
The La 3+ metal atoms are surrounded by a 7 coordinate group of O 2− atoms, the oxygen ions are in an octahedral shape around the metal atom and there is one oxygen ion above one of the octahedral faces. [4] On the other hand, at high temperatures lanthanum oxide converts to a C-M 2 O 3 cubic crystal structure.
Upon heating to 450 °C, manganese(II) nitrate gives a mixture of oxides, MnO 2-x, which can be reduced to the monoxide with hydrogen at ≥750 °C. [6] MnO is particularly stable and resists further reduction. [7] MnO can also be prepared by heating the carbonate: [8] MnCO 3 → MnO + CO 2. This calcining process is conducted anaerobically ...
Atmospheric carbon dioxide or CO 2 dissolved in water readily reacts with Bi 2 O 3 to generate bismuth subcarbonate. [12] Bismuth oxide is considered a basic oxide, which explains the high reactivity with CO 2. However, when acidic cations such as Si(IV) are introduced within the structure of the bismuth oxide, the reaction with CO 2 do not ...