Neodymyo

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Neodymium
60Nd
-

Nd

U
praseodymiumneodymiumpromethium
Appearance
silvery white
General properties
Name, simbolo, kaiphan neodymium, Nd, 60
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
Element category puthaw nga lantanido
Group, period, block [[group {{{group}}} element|{{{group}}}]], 6, f
Standard atomic weight 144.242
Electron configuration [Xe] 4f4 6s2
2, 8, 18, 22, 8, 2
Electron shells of neodymium (2, 8, 18, 22, 8, 2)
History
Discovery Carl Auer von Welsbach (1885)
Physical properties
Phase magahi
Density (near r.t.) 7.01 g·cm−3
Liquid density at m.p. 6.89 g·cm−3
Melting point 1297 K, 1024 °C, 1875 °F
Boiling point 3347 K, 3074 °C, 5565 °F
Heat of fusion 7.14 kJ·mol−1
Heat of vaporization 289 kJ·mol−1
Molar heat capacity 27.45 J·mol−1·K−1
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 states 3, 2, 1

(mildly basic oxide)

Electronegativity 1.14 (Pauling scale)
Ionization energies 1st: 533.1 kJ·mol−1
2nd: 1040 kJ·mol−1
3rd: 2130 kJ·mol−1
Atomic radius 181 pm
Covalent radius 201±6 pm
Miscellanea
Crystal structure hexagonal
Neodymium has a hexagonal crystal structure
Magnetic ordering paramagnetic, antiferromagnetic below 20 K[1]
Electrical resistivity (r.t.) (α, poly) 643 nΩ·m
Thermal conductivity 16.5 W·m−1·K−1
Thermal expansion (r.t.) (α, poly) 9.6 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2330 m·s−1
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 hardness 343 MPa
Brinell hardness 265 MPa
CAS registry number 7440-00-8
Most stable isotopes
Main article: Isotopes of neodymium
iso NA half-life DM DE (MeV) DP
142Nd 27.2% 142Nd is stable with 82 neutrons
143Nd 12.2% 143Nd is stable with 83 neutrons
144Nd 23.8% 2.29×1015 y α 1.905 140Ce
145Nd 8.3% >6×1016 y α 1.5784 141Ce
146Nd 17.2% 146Nd is stable with 86 neutrons
148Nd 5.7% >3.0×1018 y α 0.5986 144Ce
ββ 1.9288 148Sm
150Nd 5.6% 6.7×1018 y ββ 3.367 150Sm
t  h  u
· r

Ang neodymyo (Iningles neodymium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Nd ug kaiphan nga atomik 60. Ang neodymyo mao ang puthaw nga lantanido.

Ang mga gi basihan niini[usba | edit source]

  1. Gschneidner, K. A.; Eyring, L. (1978). Handbook on the Physics and Chemistry of Rare Earths. Amsterdam: North Holland. ISBN 0444850228. 


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