Samarium, 62 Sm Samarium Pípè / s ə ˈ m ɛər i ə m / (sə-MAIR -ee-əm ) Ìhànsójú silvery white Ìwúwo átọ̀mù A r, std (Sm) 150.36(2) Samarium ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 62 Ẹgbẹ́ group n/a Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-f Ẹ̀ka ẹ́límẹ́ntì LanthanideÌtò ẹ̀lẹ́ktrọ́nù [Xe ] 4f6 6s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 24, 8, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1345 K (1072 °C, 1962 °F) Ígbà ìhó 2067 K (1794 °C, 3261 °F) Kíki (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 0, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.17 Atomic radius empirical: 180 pm Covalent radius 198±8 pm Color lines in a spectral range Spectral lines of samarium Other properties Natural occurrence primordial 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 Main isotopes of samarium Isotope Abundance Half-life (t 1/2 ) Decay mode Product 144 Sm 3.07% 144 Sm is stable with 82 neutrons 146 Sm syn 1.03×108 y α 2.529 142 Nd 147 Sm 14.99% 1.06×1011 y α 2.310 143 Nd 148 Sm 11.24% 7×1015 y α 1.986 144 Nd 149 Sm 13.82% >2×1015 y α 1.870 145 Nd 150 Sm 7.38% 150 Sm is stable with 88 neutrons 152 Sm 26.75% 152 Sm is stable with 90 neutrons 154 Sm 22.75% 154 Sm is stable with 92 neutrons
Àdàkọ:Category-inline | references
Itokasi
This article uses material from the Wikipedia Yorùbá article Samarium , which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0") ; additional terms may apply (view authors ). Gbogbo ohun inú ibí yìí wà lábẹ́ CC BY-SA 4.0 àyàfi tí a bá sọ pé kò rí bẹ̀ẹ̀. Images, videos and audio are available under their respective licenses. ®Wikipedia is a registered trademark of the Wiki Foundation, Inc. Wiki Yorùbá (DUHOCTRUNGQUOC.VN) is an independent company and has no affiliation with Wiki Foundation.