Praseodymium Facts

Praseodymium Facts
Praseodymium (Pr) has an atomic number of fifty-nine, and fifty-nine protons in the nucleus of one of its atoms. It is a soft, silvery metal is a member of the rare earth metals and has one of the most refractory oxides known.
Interesting Praseodymium Facts:
Praseodymium was initially discovered by Carl Gustav Mosander of Sweden in 1841.
Mosander was working with the residue formed by preparing lantana from cerium.
It wasn't until 1885 that Austrian scientist Baron Carl Auer von Weisbach was able to extract this residue of Mosander's into two separate salts, naming them praseodymium and neodymium.
Praseodymium is named from the Greek word for green, since it oxidizes slowly in air to form a green coating.
This green oxidation coating undergoes a process called spalling, which causes it to flake off.
Storing praseodymium in mineral oil or in sealed glass prevents this oxidation.
Unlike all of the other rare earth metals, praseodymium is paramagnetic above one degree Kelvin.
Praseodymium only has one stable and naturally occurring isotope.
The other thirty-eight known isotopes are radioactive, with two having the longest half-lives at a little over thirteen days or nineteen hours.
Most of praseodymium's radioactive isotopes have half-lives of less than ten minutes.
Praseodymium is only found in the Earth's crust at around 9.5 parts per million.
Its chief sources are in the minerals monazite and bastnasite, which are rich sources of other members of the lanthanides group of elements.
Praseodymium makes up about 5% of the lanthanides found in those two minerals.
It makes up only about one part per trillion concentrated in seawater, and like other lanthanides, is almost non-existent in the atmosphere.
Praseodymium's chief commercial use history was as a yellow stain for glass and ceramic making, and that continues to be its major use today.
It also serves a role in alloying to strengthen magnesium for air craft manufacturing, and in creating yellow cubic zirconia or simulated peridot for jewelry making.

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