Samaryo

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Samarium
62Sm
-

Sm

Pu
promethiumsamariumeuropium
Appearance
silvery white
General properties
Name, simbolo, kaiphan samarium, Sm, 62
Pronunciation Plantilya:IPAc-en Plantilya:Respell
Element category puthaw nga lantanido
Group, period, block [[group {{{group}}} element|{{{group}}}]], 6, f
Standard atomic weight 150.36
Electron configuration [Xe] 6s2 4f6
2, 8, 18, 24, 8, 2
Electron shells of samarium (2, 8, 18, 24, 8, 2)
History
Discovery Lecoq de Boisbaudran (1879)
First isolation Lecoq de Boisbaudran (1879)
Physical properties
Phase magahi
Density (near r.t.) 7.52 g·cm−3
Liquid density at m.p. 7.16 g·cm−3
Melting point 1345 K, 1072 °C, 1962 °F
Boiling point 2067 K, 1794 °C, 3261 °F
Heat of fusion 8.62 kJ·mol−1
Heat of vaporization 165 kJ·mol−1
Molar heat capacity 29.54 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1001 1106 1240 (1421) (1675) (2061)
Atomic properties
Oxidation states 4, 3, 2, 1

(mildly basic oxide)

Electronegativity 1.17 (Pauling scale)
Ionization energies 1st: 544.5 kJ·mol−1
2nd: 1070 kJ·mol−1
3rd: 2260 kJ·mol−1
Atomic radius 180 pm
Covalent radius 198±8 pm
Miscellanea
Crystal structure rhombohedral
Samarium has a rhombohedral crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (r.t.) (α, poly) 0.940 µΩ·m
Thermal conductivity 13.3 W·m−1·K−1
Thermal expansion (r.t.) (α, poly) 12.7 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2130 m·s−1
Young's modulus (α form) 49.7 GPa
Shear modulus (α form) 19.5 GPa
Bulk modulus (α form) 37.8 GPa
Poisson ratio (α form) 0.274
Vickers hardness 412 MPa
Brinell hardness 441 MPa
CAS registry number 7440-19-9
Most stable isotopes
Main article: Isotopes of samarium
iso NA half-life DM DE (MeV) DP
144Sm 3.07% 144Sm is stable with 82 neutrons
145Sm syn 340 d ε - 145Pm
146Sm trace 1.03×108 y α 2.529 142Nd
147Sm 14.99% 1.06×1011 y α 2.310 143Nd
148Sm 11.24% 7×1015 y α 1.986 144Nd
149Sm 13.82% >2×1015 y α 1.870 145Nd
150Sm 7.38% 150Sm is stable with 88 neutrons
151Sm syn 90 y β - 151Eu
152Sm 26.75% 152Sm is stable with 90 neutrons
153Sm syn 46.284 h β - 153Eu
154Sm 22.75% >2.3×1018 y ββ 1.2510 154Gd
t  h  u
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Ang samaryo (Iningles samarium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Sm ug kaiphan nga atomik 62. Ang samaryo mao ang puthaw nga lantanido.

Ang mga gi basihan niini[usba | edit source]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.


Galeriya sa hulagway[usba | edit source]