Terbium, 65 Terbium Pípè / ˈ t ɜːr b i ə m / (TUR -bee-əm Ìhànsójú silvery white Ìwúwo átọ̀mù A r, std (Tb) 158.9253 54(8) Terbium ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 65 Ẹgbẹ́ group n/a Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-f Ẹ̀ka ẹ́límẹ́ntì LanthanideÌtò ẹ̀lẹ́ktrọ́nù [Xe ] 4f9 6s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 27, 8, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1629 K (1356 °C, 2473 °F) Ígbà ìhó 3503 K (3230 °C, 5846 °F) Kíki (near r.t. ) 8.23 g/cm3 when liquid (at m.p. ) 7.65 g/cm3 Heat of fusion 10.15 kJ/mol Heat of 293 kJ/mol Molar heat capacity 28.91 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1789 1979 (2201) (2505) (2913) (3491)
Atomic properties Oxidation states 0, +1, +2, +3 Electronegativity Pauling scale: ? 1.2 Atomic radius empirical: 177 pm Covalent radius 194±5 pm Color lines in a spectral range Spectral lines of terbium Other properties Natural occurrence primordial Crystal structure hexagonal Speed of sound thin rod 2620 m/s (at 20 °C) Thermal expansion (r.t.) (α, poly) 10.3 µm/(m·K) Thermal conductivity 11.1 W/(m·K) Electrical resistivity (r.t.) (α, poly) 1.150 µ Ω·m Magnetic ordering paramagnetic at 300 K Young's modulus (α form) 55.7 GPa Shear modulus (α form) 22.1 GPa Bulk modulus (α form) 38.7 GPa Poisson ratio (α form) 0.261 Vickers hardness 863 MPa Brinell hardness 677 MPa CAS Number 7440-27-9 Main isotopes of terbium Isotope Abundance Half-life (t 1/2 ) Decay mode Product 157 Tb syn 71 y ε 0.060 157 Gd 158 Tb syn 180 y ε 1.220 158 Gd β− 0.937 158 Dy 159 Tb 100% 159 Tb is stable with 94 neutrons
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