Erbium, 68 Er Erbium Pípè / ˈ ɜːr b i ə m / (UR -bee-əm ) Ìhànsójú silvery white Ìwúwo átọ̀mù A r, std (Er) 167.259(3) Erbium ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 68 Ẹgbẹ́ group n/a Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-f Ẹ̀ka ẹ́límẹ́ntì LanthanideÌtò ẹ̀lẹ́ktrọ́nù [Xe ] 4f12 6s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 30, 8, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1802 K (1529 °C, 2784 °F) Ígbà ìhó 3141 K (2868 °C, 5194 °F) Kíki (near r.t. ) 9.066 g/cm3 when liquid (at m.p. ) 8.86 g/cm3 Heat of fusion 19.90 kJ/mol Heat of 280 kJ/mol Molar heat capacity 28.12 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1504 1663 (1885) (2163) (2552) (3132)
Atomic properties Oxidation states 0, +1, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.24 Atomic radius empirical: 176 pm Covalent radius 189±6 pm Color lines in a spectral range Spectral lines of erbium Other properties Natural occurrence primordial Crystal structure hexagonal Speed of sound thin rod 2830 m/s (at 20 °C) Thermal expansion (r.t.) (poly) 12.2 µm/(m·K) Thermal conductivity 14.5 W/(m·K) Electrical resistivity (r.t.) (poly) 0.860 µ Ω·m Magnetic ordering paramagnetic at 300 K Young's modulus 69.9 GPa Shear modulus 28.3 GPa Bulk modulus 44.4 GPa Poisson ratio 0.237 Vickers hardness 589 MPa Brinell hardness 814 MPa CAS Number 7440-52-0 Main isotopes of erbium Isotope Abundance Half-life (t 1/2 ) Decay mode Product 160 Er syn 28.58 h ε 0.330 160 Ho 162 Er 0.139% 162 Er is stable with 94 neutrons 164 Er 1.601% 164 Er is stable with 96 neutrons 165 Er syn 10.36 h ε 0.376 165 Ho 166 Er 33.503% 166 Er is stable with 98 neutrons 167 Er 22.869% 167 Er is stable with 99 neutrons 168 Er 26.978% 168 Er is stable with 100 neutrons 169 Er syn 9.4 d β− 0.351 169 Tm 170 Er 14.910% 170 Er is stable with 102 neutrons 171 Er syn 7.516 h β− 1.490 171 Tm 172 Er syn 49.3 h β− 0.891 172 Tm
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