Neodymium

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Neodymium,  60Nd
Neodymium2.jpg
General properties
Appearance silvery white
Staundart atomic wecht (Ar, staundart) 144.242(3)
Neodymium 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
-

Nd

U
praseodymiumneodymiumpromethium
Atomic nummer (Z) 60
Group group n/a
Period period 6
Block f-block
Electron confeeguration [Xe] 4f4 6s2
Electrons per shell
2, 8, 18, 22, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1297 K ​(1024 °C, ​1875 °F)
Bylin pynt 3347 K ​(3074 °C, ​5565 °F)
Density (near r.t.) 7.01 g/cm3
when liquid (at m.p.) 6.89 g/cm3
Heat o fusion 7.14 kJ/mol
Heat o vapourisation 289 kJ/mol
Molar heat capacity 27.45 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1595 1774 1998 (2296) (2715) (3336)
Atomic properties
Oxidation states

3, 2, 1

(mildly basic oxide)
Electronegativity Pauling scale: 1.14
Atomic radius empirical: 181 pm
Covalent radius 201±6 pm
Color lines in a spectral range
Miscellanea
Creestal structurhexagonal
Hexagonal creestal structur for neodymium
Speed o soond thin rod 2330 m/s (at 20 °C)
Thermal expansion (r.t.) (α, poly) 9.6 µm/(m·K)
Thermal conductivity 16.5 W/(m·K)
Electrical resistivity (r.t.) (α, poly) 643 n Ω·m
Magnetic orderin paramagnetic, antiferromagnetic ablo 20 K[1]
Young's modulus (α form) 41.4 GPa
Shear modulus (α form) 16.3 GPa
Bouk modulus (α form) 31.8 GPa
Poisson ratio (α form) 0.281
Vickers haurdness 343 MPa
Brinell haurdness 265 MPa
CAS Nummer 7440-00-8
History
Diskivery Carl Auer von Welsbach (1885)
Main isotopes o neodymium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
142Nd 27.2% - (SF)
143Nd 12.2% - (α) 139Ce
144Nd 23.8% 2.29×1015 y α 140Ce
145Nd 8.3% >6×1016 y (α) 141Ce
146Nd 17.2% - (α) 142Ce
(ββ) 146Sm
148Nd 5.7% >3.0×1018 y (α) 144Ce
(ββ) 148Sm
150Nd 5.6% 6.7×1018 y ββ 150Sm
Decay modes in parentheses are predictit, but hae nae yet been observed
| references | in Wikidata

Neodymium is a chemical element wi the seembol Nd an atomic nummer 60. It is a saft sillery metal that tarnishes in air. Neodymium wis discovered in 1885 bi the Austrian chemist Carl Auer von Welsbach. It is present in signeeficant quantities in the ore minerals monazite an bastnäsite. Neodymium is nae foond naiturally in metallic furm or unmixed wi ither lanthanides, an it is uisually refined for general uise. Altho neodymium is classed as a "rare yird", it is a fairly common element, na rarer nor cobalt, nickel, an copper, an is widely distributit in the Yird's crust.[2] Maist o the warld's neodymium is mined in Cheenae.

References[eedit | eedit soorce]

  1. Gschneidner, K. A.; Eyring, L. (1978). Handbook on the Physics and Chemistry of Rare Earths. Amsterdam: North Holland. ISBN 0444850228. 
  2. See Abundances o the elements (data page)