We review the observational evidence of actinides found in the Solar system and in metal-poor stars and comment on the prospective of observing heavy-element production in explosive astrophysical events. Finally, we discuss the possibility that future observations and laborat...
It is an actinide and the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not yet been prepared.[3] A total of 19 isotopes are known, with 257Fm being...
Another way to look at heaviness is in terms of density, which is mass per unit volume. Either of two elements can be considered theelement with the highest density:osmiumandiridium. The density of the element depends on many factors, so there isn't a single number for density that would ...
METAL-POOR STARSPROCESS-ENHANCED STARFISSION HALF-LIVESThe rapid neutron capture or "r process' of nucleosynthesis is believed to be responsible for the production of approximately half the natural abundance of heavy elements found on the periodic table above iron (with proton number Z = 26) and...
The prototype for this property is element 114 which, due to the relativistic stabilization of its 7s2 7p21/2 electron configuration, is volatile in its elementary state, but, in contrast to a noble gas, exhibits a marked metalmetal interaction with a gold surface at room temperature. Nuclear...