The transuranic elements from americium to fermium, including berkelium, occurred naturally in the natural nuclear fission reactor at Oklo, but no longer do so.
32.
The most difficult steps in the synthesis of berkelium were its separation from the final products and the production of sufficient quantities of americium for the target material.
33.
Berkelium ( IV ) fluoride ( BkF 4 ) is a yellow-green ionic solid and is isotypic with uranium tetrafluoride or zirconium ( IV ) fluoride.
34.
Visible amounts of berkelium ( III ) chloride ( BkCl 3 ) were first isolated and characterized in 1962, and weighed only 3 billionths of a gram.
35.
Thermal decomposition at about 600 �C in an argon atmosphere ( to avoid oxidation to ) of yields the crystals of berkelium ( III ) oxysulfate ( ).
36.
This emission can be observed, for example, after dispersing berkelium ions in a silicate glass, by melting the glass in presence of berkelium oxide or halide.
37.
This emission can be observed, for example, after dispersing berkelium ions in a silicate glass, by melting the glass in presence of berkelium oxide or halide.
38.
It is then treated with high-pressure elution from cation exchange resins, and the berkelium phase is oxidized and extracted using one of the procedures described above.
39.
Of the actinides, environment; analysis of debris from a 1952 hydrogen bomb explosion showed the presence of americium, curium, berkelium, californium, einsteinium and fermium.
40.
They were plutonium, americium ( used today in smoke detectors ), curium ( used in medicine ), berkelium, californium, einsteinium, fermium, mendelevium and nobelium.
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