ଛାଞ୍ଚ:Infobox Samarium

Samarium,  ₆₂Sm

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	samarium, Sm
Appearance	silvery white
ଉଚ୍ଚାରଣ	/səˈmɛəriəm/ sə-MAIR-ee-əm
Samarium in the periodic table
- ↑ Sm ↓ Pu promethium ← samarium → europium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	62
ଶ୍ରେଣୀ, ବ୍ଳକ	group n/a, f-block
ପର୍ଯ୍ୟାୟ	period 6
ମୌଳିକ ପ୍ରକାର	lanthanide
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	150.36
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Xe] 6s2 4f6
per shell	2, 8, 18, 24, 8, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	1345 K ​(1072 °C, ​1962 °F)
ସ୍ଫୁଟନାଙ୍କ	2067 K ​(1794 °C, ​3261 °F)
Density near r.t.	7.52 g/cm3
when liquid, at m.p.	7.16 g/cm3
Heat of fusion	8.62 kJ/mol
Heat of	165 kJ/mol
Molar heat capacity	29.54 J/(mol·K)
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	Pauling scale: 1.17
Atomic radius	empirical: 180 pm
Covalent radius	198±8 pm
Miscellanea
Crystal structure	​rhombohedral
Speed of sound thin rod	2130 m/s (at 20 °C)
Thermal expansion	(r.t.) (α, poly) 12.7 µm/(m·K)
Thermal conductivity	13.3 W/(m·K)
Electrical resistivity	(r.t.) (α, poly) 0.940 µ Ω·m
Magnetic ordering	paramagnetic
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 Number	7440-19-9
ଇତିହାସ
ଆବିଷ୍କାର	Lecoq de Boisbaudran (1879)
First isolation	Lecoq de Boisbaudran (1879)
Most stable 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 β−β− 1.2510 154Gd

References

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