Praseodymium

Praseodymium
Praseodymium
Symbol Pr
Atomic Number 59
Atomic Mass 140.91 g.mol -1
Discovered by Carl Auer von Welsbach in 1885

Chemical Properties of Praseodymium

Group Lanthanides  Melting point 931°C, 1708°F, 1204 K
Period 6 Boiling point 3520°C, 6368°F, 3793 K
Block f Density (g cm−3) 6.77
Atomic number 59 Relative atomic mass 140.908
State at 20°C Solid Key isotopes 141Pr
Electron configuration [Xe] 4f6s2 CAS number 7440-10-0
ChemSpider ID 22384 ChemSpider is a free chemical structure database.

What is Praseodymium?

  • Praseodymium metal is a soft, silvery, ductile and malleable element present in the periodic table with atomic number 59 and symbol Pr.
  • Praseodymium element was first discovered by a German chemist named Carl F. Auer von Welsbach, in 1885. This element was separated from the neodymium, from another material called as didymium.
  • Today, the metal praseodymium is mainly obtained from the process of ion exchange through monazite sand, which is a precious earth element.
  • It is rarely found in the earth’s crust at about 8.7 parts/million by weight and comes among the lists of lanthanides.

Uses of Praseodymium

  • It is used in the aircraft engines in the form of alloying agent and for the purpose of creating high field strengths.
  • The alloys of the metal such as the pyrophoric alloy are used in the lighter flints which are used to light cigarettes.
  • The carbon electrodes used in the arc lightning lamps make use of the oxides of Praseodymium.
  • It is also used as catalysts and in polishing of glass.
  • It is utilized in the permanent magnets present in the wind turbines and motors.
  • It is also used in the manufacture of welders and glass bowlers.

Properties of Praseodymium

  • The element tends to form a black coating in the presence of air. Like other metals, Praseodymium does not get oxidized or does not possess the corrosion resistant feature.
  • In the reaction with water, the metal forms praseodymium hydroxide giving out hydrogen gas. The metal usually exists in its trivalent state, Pr3+, in the compound form. The salts of this substance appear as pale green color.

Effects Of Praseodymium

  • Praseodymium gets accumulated in the soil and also water. This increases the concentration of lead in humans, soil particles, and animals. It also damages the cell membranes and also has bad influences on the reproduction. It also affects the nervous system in humans.
  • The salts of this metal are highly toxic in nature and can cause many severe disorders such as skin and eye irritation.

Practise This Question

Concentration is also called “Ore dressing” or “Benefaction”. True or False?