Pushing the known limits of lanthanide oxidation, chemists have isolated praseodymium (Pr) in the +5 oxidation state. While Pr 5+ compounds have been observed in the gas phase and in noble gas matrix ...

Certain elements (gold, silver) haven't gone out of fashion in millennia and probably never will. Others seem unlikely ever to win popularity with the public (hello, praseodymium). Still other ...

One hundred fifty years after Russian chemist Dmitri Mendeleev published his system for neatly arranging the elements, the periodic table it gave birth to hangs in every chemistry classroom in the ...