నియోడిమియం, 00Nd
నియోడిమియం
Pronunciation/ˌnˈdɪmiəm/ (NEE-oh-DIM-ee-əm)
Appearancesilvery white
Standard atomic weight Ar°(Nd)
నియోడిమియం 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
-

Nd

U
ప్రాసియోడిమియంనియోడిమియంప్రోమిథియం
Groupమూస:Infobox element/symbol-to-group/format
Periodperiod 6
Block  f-block
Electron configuration[Xe] 4f4 6s2
Electrons per shell2, 8, 18, 22, 8, 2
Physical properties
Phase at STPsolid
Melting point1297 K ​(1024 °C, ​1875 °F)
Boiling point3347 K ​(3074 °C, ​5565 °F)
Density (near r.t.)7.01 g/cm3
when liquid (at m.p.)6.89 g/cm3
Heat of fusion7.14 kJ/mol
Heat of vaporization289 kJ/mol
Molar heat capacity27.45 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1595 1774 1998 (2296) (2715) (3336)
Atomic properties
Oxidation states0,[3] +2, +3, +4 (a mildly basic oxide)
ElectronegativityPauling scale: 1.14
Atomic radiusempirical: 181 pm
Covalent radius201±6 pm
Color lines in a spectral range
Spectral lines of నియోడిమియం
Other properties
Natural occurrenceprimordial
Crystal structurehexagonal
Hexagonal crystal structure for నియోడిమియం
Speed of sound thin rod2330 m/s (at 20 °C)
Thermal expansion(r.t.) (α, poly) 9.6 µm/(m⋅K)
Thermal conductivity16.5 W/(m⋅K)
Electrical resistivity(r.t.) (α, poly) 643 n Ω⋅m
Magnetic orderingparamagnetic, antiferromagnetic below 20 K[4]
Young's modulus(α form) 41.4 GPa
Shear modulus(α form) 16.3 GPa
Bulk modulus(α form) 31.8 GPa
Poisson ratio(α form) 0.281
Vickers hardness343 MPa
Brinell hardness265 MPa
CAS Number7440-00-8
History
DiscoveryCarl Auer von Welsbach (1885)
Isotopes of నియోడిమియం
Template:infobox నియోడిమియం isotopes does not exist
 Category: నియోడిమియం
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References

  1. "Standard Atomic Weights: Neodymium". CIAAW. 2005.
  2. 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.
  3. 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.
  4. Gschneidner, K. A.; Eyring, L. (1978). Handbook on the Physics and Chemistry of Rare Earths. Amsterdam: North Holland. ISBN 0444850228.