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Pr occurs as chemical element in the periodic table that has the symbol Pr & atomic number 59.

Notable characteristics
Pr occurs as easy silvery metallic element, and belongs to the lanthanide group. These are somewhat additional insubordinate to corrosion in air than europium, lanthanum, cerium, or neodymium, but it does produce the green oxide coating that spalls off when studied to air, exposing other metal to oxidation. For this understanding, pr should become stored under the lightly mineral oil or sealed in glass.

Applications
Utilizes of atomic number 59:

As an alloying agent sustaining magnesium to create high-nature and severity metals that come utilized within aircraft engines. Atomic number 59 forms a core of carbon arc lights which are utilized in the motion picture industry for studio lighting and projector lights. Atomic number 59 compounds are used to give glasses and enamels a yellow color. Pr occurs as component of didymium glass, which is used to produce certain types of welder's and glass blower's goggles.

History
A title Praseodymium comes from either a Greek prasios, meaning green, and didymos, or even twin.

Around 1841, Mosander extracted the uncommon globe didymium from lanthana. Around 1874, Per Teodor Cleve concluded that didymium was inside fact ii elements, & in 1879, Lecoq de Boisbaudran isolated a freshly globe, Samarium, from either didymium found from a mineral samarskite. Within 1885, the Austrian chemist baron Carl Auer von Welsbach separated didymium into two elements, Pr & Neodymium, which gave salts of different colors.

Occurrence
Atomic number 59 is obtained in the uncommon globe minerals monazite and bastnasite, and may be recovered from either bastnaesite or even monazite by an ion exchange process. Pr too is just about 5% of Misch metal.

Compounds
Atomic number 59 compounds include:

Fluorides PrF₂ PrF₃ PrF₄ Chlorides PrCl₃ Bromides PrBr₃ Pr₂Br₅ Iodides PrI₂ PrI₃ Pr₂I₅ Oxides PrO₂ Pr₂O₃ Sulfides PrS Pr₂S₃ Selenides PrSe Tellurides PrTe Pr₂Te₃ Nitrides PrN

Isotopes
Naturally occurring atomic number 59 is composed of a single stable isotope, 141-Pr. 38 radioisotopes have been characterized by using the virtually all stalls existence 143-Pr with a half-life of 13.57 years & 142-Pr using the half-life of Xix.Xii hours. A lot of the leftover radioactive isotopes have half-lifes that come less than Pentad.985 hours & a majority one stand half lifes that come less than 33 seconds. This element likewise has Sestet meta states with the virtually all stalls existence 138m-Pr (t_½ Ii.Xii hours), 142m-Pr (t_½ Fourteen.Hexad transactions) & 134m-Pr (t_½ Eleven proceedings).

A isotopes of pr zero in atomic weight from 120.955 u (121-Pr) to 158.955 u (159-Pr). A primary decay mode before the stable isotope, 141-Pr, is electron capture and the primary mode when is beta minus decay. A primary decay products before 141-Pr come element 58 (Cerium) isotopes and a primary products fallowing come element Sixty (Neodymium) isotopes.

Precautions
Prefer tons uncommon earths, atomic number 59 is of online to moderate toxicity. Pr has there are no known biological role.