The initial steps are the same as above, and employs HDEHP for extraction chromatography, but coprecipitates the mendelevium with terbium fluoride instead of lanthanum fluoride.
22.
In 1955, mendelevium was synthesized by irradiating a target consisting of about 10 9 atoms of 253 Es in the 60-inch cyclotron at Berkeley Laboratory.
23.
The chemistry of mendelevium is typical for the late actinides, with a preponderance of the + 3 oxidation state but also an accessible + 2 oxidation state.
24.
Some of these elements, like carbon and iron, will be familiar to you, and others, like ytterbium and mendelevium, are probably new to you.
25.
In 1955, element 101 was discovered and named mendelevium in honor of D . I . Mendeleev, the first to arrange the elements in a periodic manner.
26.
However, later experiments found no evidence for mendelevium ( I ) and found that mendelevium behaved like divalent elements when reduced, not like the monovalent alkali metals.
27.
However, later experiments found no evidence for mendelevium ( I ) and found that mendelevium behaved like divalent elements when reduced, not like the monovalent alkali metals.
28.
Then, 50 mg of chromium is added to the mendelevium to reduce it to the + 2 state in 0.1 M hydrochloric acid with zinc or mercury.
29.
They were plutonium, americium ( used today in smoke detectors ), curium ( used in medicine ), berkelium, californium, einsteinium, fermium, mendelevium and nobelium.
30.
Cation-exchange and solvent extraction studies led to the conclusion that mendelevium was a trivalent actinide with an ionic radius somewhat smaller than that of the previous actinide, fermium.
