Holmium, 67 Ho Holmium Pípè / ˈ h oʊ l m i ə m / (HOHL -mee-əm ) Ìhànsójú silvery white Ìwúwo átọ̀mù A r, std (Ho) 164.9303 28(7) Holmium ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 67 Ẹgbẹ́ group n/a Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-f Ẹ̀ka ẹ́límẹ́ntì LanthanideÌtò ẹ̀lẹ́ktrọ́nù [Xe ] 4f11 6s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 29, 8, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1734 K (1461 °C, 2662 °F) Ígbà ìhó 2993 K (2720 °C, 4928 °F) Kíki (near r.t. ) 8.79 g/cm3 when liquid (at m.p. ) 8.34 g/cm3 Heat of fusion 17.0 kJ/mol Heat of 265 kJ/mol Molar heat capacity 27.15 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1432 1584 (1775) (2040) (2410) (2964)
Atomic properties Oxidation states 0, +1, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.23 Atomic radius empirical: 176 pm Covalent radius 192±7 pm Color lines in a spectral range Spectral lines of holmium Other properties Natural occurrence primordial Crystal structure hexagonal Speed of sound thin rod 2760 m/s (at 20 °C) Thermal expansion (r.t.) (poly) 11.2 µm/(m·K) Thermal conductivity 16.2 W/(m·K) Electrical resistivity (r.t.) (poly) 814 n Ω·m Magnetic ordering paramagnetic Young's modulus 64.8 GPa Shear modulus 26.3 GPa Bulk modulus 40.2 GPa Poisson ratio 0.231 Vickers hardness 481 MPa Brinell hardness 746 MPa CAS Number 7440-60-0 Main isotopes of holmium Isotope Abundance Half-life (t 1/2 ) Decay mode Product 163 Ho syn 4570 yr ε 0.003 163 Dy 164 Ho syn 29 min ε 0.987 164 Dy 165 Ho 100% 165 Ho is stable with 98 neutrons 166 Ho syn 26.763 h β− 1.855 166 Er 167 Ho syn 3.1 h β− 1.007 167 Er
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