Praseodymium

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Praseodymium,  59Pr
Praseodymium.jpg
General properties
Appearance grayish white
Staundart atomic wecht (Ar, staundart) 140.90766(2)
Praseodymium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
-

Pr

Pa
ceriumpraseodymiumneodymium
Atomic nummer (Z) 59
Group group n/a
Period period 6
Element category   lanthanide
Block f-block
Electron confeeguration [Xe] 4f3 6s2
Electrons per shell
2, 8, 18, 21, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1208 K ​(935 °C, ​1715 °F)
Bylin pynt 3793 K ​(3520 °C, ​6368 °F)
Density (near r.t.) 6.77 g/cm3
when liquid (at m.p.) 6.50 g/cm3
Heat o fusion 6.89 kJ/mol
Heat o vapourisation 331 kJ/mol
Molar heat capacity 27.20 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1771 1973 (2227) (2571) (3054) (3779)
Atomic properties
Oxidation states 4, 3, 2 (mildly basic oxide)
Electronegativity Pauling scale: 1.13
Atomic radius empirical: 182 pm
Covalent radius 203±7 pm
Color lines in a spectral range
Miscellanea
Creestal structur hexagonal
Hexagonal creestal structur for praseodymium
Speed o soond thin rod 2280 m/s (at 20 °C)
Thermal expansion (r.t.) (α, poly) 6.7 µm/(m·K)
Thermal conductivity 12.5 W/(m·K)
Electrical resistivity (r.t.) (α, poly)
0.700 µ Ω·m
Magnetic orderin paramagnetic[1]
Young's modulus (α form) 37.3 GPa
Shear modulus (α form) 14.8 GPa
Bouk modulus (α form) 28.8 GPa
Poisson ratio (α form) 0.281
Vickers haurdness 400 MPa
Brinell haurdness 481 MPa
CAS Nummer 7440-10-0
History
Diskivery Carl Auer von Welsbach (1885)
Main isotopes o praseodymium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
141Pr 100% - (SF)
142Pr syn 19.12 h β 2.162 142Nd
ε 0.745 142Ce
143Pr syn 13.57 d β 143Nd
Decay modes in parentheses hae been predictit, but hae nae yet been observed
| references | in Wikidata

Praseodymium is a chemical element that haes the seembol Pr an atomic nummer 59. Praseodymium is a saft, sillery, malleable an ductile metal in the lanthanide group. It is too reactive tae be foond in native furm, an when airtificially prepared, it slowly develops a green oxide coatin.

References[eedit | eedit soorce]

  1. M. Jackson "Magnetism of Rare Earth" The IRM quarterly col. 10, No. 3, p. 1, 2000
  2. "praseodymium". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005.  (Subscription or UK public library membership required.)