Holmium
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| Holmium |
|
67Ho
|
|
|
| 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/a, 6, 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
|
| 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 |
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· r |
