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promethium ionScientific American
•87% Informative
Researchers at Oak Ridge National Laboratory in Tennessee have become the first to use radioactive promethium to make a chemical complex’ — a compound in which it is bound to a few surrounding molecules.
This feat of synthesis enabled the team to study how the element bonds with other atoms in a solution with water.
The findings fill a long-standing gap in chemistry textbooks.
Oak Ridge researchers were able to see this lanthanide contraction in the bond lengths across their newly synthesized collection.
They also observed that the decrease in bond length in the earlier part of the series, from lanthanum to promethium, was sharper than in the later part.
Although these results are not especially surprising, says Alexander Ivanov , a chemist at Oak Ridge .
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