Transuranium actinides

Symbol Cm atomic number 96 atomic weight 247 a radioactive transuranium actinide series element electron configuration [Rn]5/ 6di7s2 most stable valence state +3 most stable isotope Cm-247. Curium isotopes, half-hves and decay modes are ... 

Symbol Es atomic number 99 atomic weight 252 a radioactive transuranium, actinide series, manmade element electron configuration [Rn]5/ i7s2 the most stable isotope Es-254. Isotopes, their half-lives and the mode of decay are as follows ... 

Gas-phase reactions of the bare monopositive berkelium ion, Bk+, with several reagents including cycloocta-tetraene have been examined by a mass spectrometric technique adapted for the highly radioactive transuranium actinides. The products included 7r-bonded organoberkelium ions such as BkCOT+, presumably, the berkelium-cyclooctatetraenyl half-sandwich complex ion.22... 

Metz C, Waterbury G. 1962. The transuranium actinide elements. In Kolthoff I, Elving P, eds. Treatise on analytical chemistry. Part II. Analytical chemistry of the elements. Vol 9. The transuranium actinide elements. New York Interscience Publishers, 228-229. 

Criticality of Transuranium Actinides— Undermoderated Systems, S. R, Bierman, E. D. Clayton (PNL)... 

Ihe Zartman Committee identified a numW of criticality areas in which data were considered deficient by ARC contractors and commercial organizations. The needs that were emphasized and subsequent changes of status are summarized in the folfowlng table. - fo addition to the items listed, the Increased importance of LMFBR mixed-oxide fuel has led to new experimental data that may be sufQcient for small-scale processing but probably will not satisfy ultimate requirements. Criticality problems with h>u were afforded low priority by the Committee, and it seems that indirect experimental evidence can continue to suffice until large-scale an>ticattons develop. Ultimately, however, experimental checkpoints will be desired for n, "Cm. and certain other transuranium actinides. ... 

Each of the four kinetic regions observed in fig. 14 corresponds to control of the bulk hydriding rate by a separate process. The decrease in r as P approaches P is clearly thermodynamic in nature because r approaches zero as the thermochemical activity gradient driving the reaction approaches zero. As described by Haschke (1991), the approach to equilibrium gives rise to the rate decreases observed at high temperature in Arrhenius data for the U-l-H system under isobaric conditions. Unlike the U-UH3 system, equilibrium pressures for the metal-hydride systems of the lanthanides and transuranium actinides are not in the 0.1 to 1 bar range frequently employed in hydride... 

More Than Just 92 Elements - The Transuranium Actinides... 

The properties of some isotopes of the transuranium actinides are collected in Table 52.4. 

For uranium, it is valid to assume that oxidation states above U(VI) are inaccessible so that the O-atom ligand in the product of Eq. (26) is presumably 0 and that it in the product of Eq. (27) is presumably. These results with uranyl illustrate the utility of the NO3 ligand as a source of O atoms in CID. These studies should be extended to transuranium actinides, specifically Np02 and Pu02, where higher oxidatimi states may be accessed by replacement of NO3 by 0 . 

---