Holmium

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Holmium
67Ho
-

Ho

Es
dysprosiumholmiumerbium
Ìhànsójú
silvery white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà holmium, Ho, 67
Ìpèlóhùn /ˈhoʊlmiəm/, HOHL-mee-əm
Ẹ̀ka ẹ́límẹ̀nti lanthanide
Ẹgbẹ́, àsìkò, àdìpò n/a6, f
Ìwúwo átọ́mù 164.93032
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 4f11 6s2
2, 8, 18, 29, 8, 2
Physical properties
Phase solid
Density (near r.t.) 8.79 g·cm−3
Liquid density at m.p. 8.34 g·cm−3
Melting point 1734 K, 1461 °C, 2662 °F
Boiling point 2993 K, 2720 °C, 4928 °F
Heat of fusion 17.0 kJ·mol−1
Heat of vaporization 265 kJ·mol−1
Molar heat capacity 27.15 J·mol−1·K−1
Vapor 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 3 (basic oxide)
Electronegativity 1.23 (Pauling scale)
Ionization energies 1st: 581.0 kJ·mol−1
2nd: 1140 kJ·mol−1
3rd: 2204 kJ·mol−1
Atomic radius 176 pm
Covalent radius 192±7 pm
Miscellanea
Crystal structure hexagonal
Holmium has a hexagonal crystal structure
Magnetic ordering paramagnetic
Electrical resistivity (r.t.) (poly) 814 nΩ·m
Thermal conductivity 16.2 W·m−1·K−1
Thermal expansion (r.t.) (poly) 11.2 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2760 m·s−1
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 registry number 7440-60-0
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù holmium
iso NA half-life DM DE (MeV) DP
163Ho syn 4570 yr ε 0.003 163Dy
164Ho syn 29 min ε 0.987 164Dy
165Ho 100% 165Ho is stable with 98 neutrons
166Ho syn 26.763 h β 1.855 166Er
167Ho syn 3.1 h β 1.007 167Er
· r


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