Welcome to our book review site go-pdf.online!
You may have to Search all our reviewed books and magazines, click the sign up button below to create a free account.
Heats of Reactions of Some Oxides of Americium and Praseodymium with Nitric Acid and an Estimate of the Potentials of the Am(III)-Am(IV) and Pr(III)-Pr(IV) Couples
It has been shown previously that the potential of the Am(III)-Am(IV) couple in acid solution is more negative than -2.0v. The work described in this paper was undertaken for the purpose of evaluating the magnitude of the potential more precisely. It seems scarcely necessary to remark that an extensive correlation of the chemical properties of an element is possible when its oxidation potentials are known The chemistry of americium possesses special interest in that it is the first of the transuranium elements in which the stability of the tripositive state is comparable to that observed for some of the lanthanide elements.
The Absorption Spectrum of Americium
The absorption spectra of aqueous solutions and solid compounds of americium have been investigated with a Baird 3-meter grating spectrograph. The relation of the spectrum to that of other actinide and rare-earth compounds is discussed. It has long been observed that the absorption spectra of the trivalent rare-earth ions possess a unique sharpness, the structure of the peaks being discernible at room temperature and even in solutions. This phenomenon has also been observed in the case of the electronically analogous actinide elements. The generally accepted explanation for the origin of the lines in the rare-earth spectra is that they result from transitions within the 4f electron shell. Trivalent europium, the analog of americium, has been shown by absorption spectra and magnetic susceptibility data to have a 4f(6) electron configuration, a (7)F sub 0 ground state, and one or more low-lying excited levels. Since americium ion probably has a 5f(6) configuration, it also is expected to have a singlet ground state and one or more low-lying excited levels. p4.
