What is PR? Important knowledge about PR.

  1. Definition of Pr:
    Praseodymium, also known as Pr, is a chemical element with the symbol Pr and atomic number 59. Praseodymium belongs to the lanthanide group in the periodic table, a group of elements collectively referred to as “rare earth elements”. Praseodymium has an atomic mass of 140.90765u. Praseodymium molecules commonly exist as Pr+3 ions in compounds.

  2. Properties of Pr:
    2.1 Physical properties: Pr is a soft, silver metal with no odor. It has a neutral pH, meaning it is neither acidic nor alkaline.
    2.2 Chemical properties: Praseodymium easily reacts with oxygen to form praseodymium(III) oxide.

  3. Common chemical equations of Pr:
    Pr + O2 -> Pr2O3
    Pr + H2O -> Pr(OH)3 + H2
    Pr + H2 -> PrH2
    Pr + F2 -> PrF3
    Pr + Cl2 -> PrCl3

  4. Preparation of Pr:
    4.1 Laboratory preparation: Praseodymium cannot be prepared in the laboratory as it can only be extracted from its ore through a complex and costly process.
    4.2 Industrial preparation: Praseodymium is typically extracted from the ores monazite and bastnasite, both of which contain numerous rare earth elements. The extraction process involves running the ore through a series of chemicals to remove undesired substances and separate Praseodymium from other elements.

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