د ويکيپېډيا، وړیا پوهنغونډ له خوا
Samarium, 62 Sm Pronunciation / s ə ˈ m ɛər i ə m / sə-MAIR -ee-əm Appearance silvery white اټومي شمیره (Z ) 62 گروپ , پیریود group n/a , period 6 بلاک f-block Element category lanthanide معياري اټومي وزن (A r ) کينډۍ:Val [ ۱] Electron configuration [Xe ] 4f6 6s2 Electrons per shell
2, 8, 18, 24, 8, 2 حالت (at STP ) جامد دويلې کيدو ټکى 1345 K (1072 °C, 1962 °F) يشنا ټکی 2173 K (1900 °C, 3452 °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 vaporization 192 kJ/mol Molar heat capacity 29.54 J/(mol·K) Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
1001
1106
1240
(1421)
(1675)
(2061)
Oxidation states 4, 3 , 2, 1 (a mildly basic oxide)Electronegativity Pauling scale: 1.17 Ionization energies 1st: 544.5 kJ/mol 2nd: 1070 kJ/mol 3rd: 2260 kJ/mol Atomic radius empirical: 180 pm Covalent radius 198±8 pm Crystal structure rhombohedral Rhombohedral crystal structure for samarium Speed of sound thin rod 2130 m/s (at 20 °C) Thermal expansion (r.t. ) (α, poly) 12.7 µm/(m·K) د تودوخې تېرېدنه 13.3 W/(m·K) Electrical resistivity (r.t. ) (α, poly) 0.940 µΩ·m Magnetic ordering paramagnetic [ ۲] Magnetic susceptibility (χ mol ) +1860.0·10−6 cm3 /mol (291 K)[ ۳] 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 410–440 MPa Brinell hardness 440–600 MPa CAS Number 7440-19-9 Naming after the mineral samarskite (itself named after Vasili Samarsky-Bykhovets ) Discovery and first isolationLecoq de Boisbaudran (1879)
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ساماريوم (په انگرېزي : Samarium ) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Sm سمبول او ۶۲ اتمي شمېرې په وسیله ښودل شوی دی.
↑ Meija, J.; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)" . Pure Appl. Chem. 88 (3): 265–91. doi :10.1515/pac-2015-0305 .
↑ Lide, D. R., سمونګر (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (چاپ 86th). Boca Raton (FL): CRC Press. د کتاب نړيواله کره شمېره 0-8493-0486-5 .
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics . Boca Raton, Florida: Chemical Rubber Company Publishing. مخونه E110. د کتاب نړيواله کره شمېره 0-8493-0464-4 .
دا ليکنه نابشپړه ده، تاسې ددې ليکنې په بشپړولو کې د ويکيپېډيا سره مرسته کولای شئ.