మూస:Infobox praseodymium

వికీపీడియా నుండి
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ప్రాసియోడిమియం, 00Pr
ప్రాసియోడిమియం
Pronunciation/ˌprzəˈdɪmiəm/[1] (PRAY-zee-ə-DIM-ee)
Appearancegrayish white
Standard atomic weight Ar°(Pr)
ప్రాసియోడిమియం in the periodic table
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 Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver 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 Mercury (element) Thallium Lead 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
సీరియంప్రాసియోడిమియంనియోడిమియం
Groupమూస:Infobox element/symbol-to-group/format
Periodperiod 6
Block  f-block
Electron configuration[Xe] 4f3 6s2
Electrons per shell2, 8, 18, 21, 8, 2
Physical properties
Phase at STPsolid
Melting point1208 K ​(935 °C, ​1715 °F)
Boiling point3793 K ​(3520 °C, ​6368 °F)
Density (near r.t.)6.77 g/cm3
when liquid (at m.p.)6.50 g/cm3
Heat of fusion6.89 kJ/mol
Heat of vaporization331 kJ/mol
Molar heat capacity27.20 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1771 1973 (2227) (2571) (3054) (3779)
Atomic properties
Oxidation states0,[4] +1,[5] +2, +3, +4, +5 (a mildly basic oxide)
ElectronegativityPauling scale: 1.13
Atomic radiusempirical: 182 pm
Covalent radius203±7 pm
Color lines in a spectral range
Spectral lines of ప్రాసియోడిమియం
Other properties
Natural occurrenceprimordial
Crystal structurehexagonal
Hexagonal crystal structure for ప్రాసియోడిమియం
Speed of sound 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 orderingparamagnetic[6]
Young's modulus(α form) 37.3 GPa
Shear modulus(α form) 14.8 GPa
Bulk modulus(α form) 28.8 GPa
Poisson ratio(α form) 0.281
Vickers hardness400 MPa
Brinell hardness481 MPa
CAS Number7440-10-0
History
DiscoveryCarl Auer von Welsbach (1885)
Isotopes of ప్రాసియోడిమియం
Template:infobox ప్రాసియోడిమియం isotopes does not exist
 Category: ప్రాసియోడిమియం
| references

References

  1. మూస:OED
  2. "Standard Atomic Weights: Praseodymium". CIAAW. 2017.
  3. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; et al. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (in ఇంగ్లీష్). doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  4. Yttrium and all lanthanides except Ce and Pm have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev. 22: 17–24. doi:10.1039/CS9932200017. and Arnold, Polly L.; Petrukhina, Marina A.; Bochenkov, Vladimir E.; Shabatina, Tatyana I.; Zagorskii, Vyacheslav V.; Cloke (2003-12-15). "Arene complexation of Sm, Eu, Tm and Yb atoms: a variable temperature spectroscopic investigation". Journal of Organometallic Chemistry. 688 (1–2): 49–55. doi:10.1016/j.jorganchem.2003.08.028.
  5. Chen, Xin; et al. (2019-12-13). "Lanthanides with Unusually Low Oxidation States in the PrB3– and PrB4– Boride Clusters". Inorganic Chemistry. 58 (1): 411–418. doi:10.1021/acs.inorgchem.8b02572. PMID 30543295. S2CID 56148031.
  6. M. Jackson "Magnetism of Rare Earth" The IRM quarterly col. 10, No. 3, p. 1, 2000
  7. మూస:OED