Uranous periodate

In 1872 Mendeleeft pointed out that there was no place in the Periodic Table for a trivalent element of atomic weight 120, and drew attention to the similarity of uranium to chromium, molybdenum, and tungsten he therefore suggested that the atomic weight should be doubled, so that uranium could be placed below these elements in the table. He also formulated the oxides, by analog with those of the other elements in the group, as follows uranous oxide UOg, urano-... 

Uranyl ions or compounds present in the sediment cannot remain in this oxidation state indefinitely, although there are suggestions that reduction to uranous dioxide does not occur rapidly in carbonaceous sediments. However, with maturation of the carbonaceous matter, the adsorption sites are lost, and if reduction had not already occurred, the desorbed uranyl ion would then be reduced to UO2. Since the maturation of carbonaceous matter is a slow, progressive process, any desorbed UO2 would be released in very small amounts over long periods. There is thus the possibility of UO2 entering the formation water in colloidal form and having enough mobility to move to a site of concentration. 

Fluorocarbons Polychloro- trifluoroe- thylene, polytetra- fluoro- ethylene, polyvinyl fluoride, polymono- chlorotri- fluoro- ethylene Trichloro- ethylene 1. Wipe vrith solvent and treat with the following for 15 min at RT Naphthalene (128 g) dissolved in tetrahydrof uran (11) to which is added sodium (23 g) during a stirring period of 2 h. Rinse in deionized water, and dry in water air Sodium-treated surfaces must not be abraded before use. Hazardous etching solutions requirii skillful handling. Proprietary etching solutions are... 

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