Praseodymium

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Praseodymium,  59Pr
Praseodymium.jpg
General properties
Appearancegrayish white
Staundart atomic wecht (Ar, staundart)140.90766(1)[1]
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 Gowd 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
Groupgroup n/a
Periodperiod 6
Element category  lanthanide
Blockf-block
Electron confeeguration[Xe] 4f3 6s2
Electrons per shell
2, 8, 18, 21, 8, 2
Pheesical properties
Phase (at STP)solit
Meltin pynt1208 K ​(935 °C, ​1715 °F)
Bylin pynt3793 K ​(3520 °C, ​6368 °F)
Density (near r.t.)6.77 g/cm3
when liquid (at m.p.)6.50 g/cm3
Heat o fusion6.89 kJ/mol
Heat o vapourisation331 kJ/mol
Molar heat capacity27.20 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 states4, 3, 2 (mildly basic oxide)
ElectronegativityPauling scale: 1.13
Atomic radiusempirical: 182 pm
Covalent radius203±7 pm
Coloyr lines in a spectral range
Spectral lines o Praseodymium
Miscellanea
Creestal structurhexagonal
Hexagonal creestal structur for praseodymium
Speed o soond thin rod2280 m/s (at 20 °C)
Thermal expansion(r.t.) (α, poly) 6.7 µm/(m·K)
Thermal conductivity12.5 W/(m·K)
Electrical resistivity(r.t.) (α, poly)
0.700 µ Ω·m
Magnetic orderinparamagnetic[2]
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 haurdness400 MPa
Brinell haurdness481 MPa
CAS Nummer7440-10-0
History
DiskiveryCarl 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 142Nd
ε 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.

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