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|
Holmium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Ho | 67 | 164.93032 | 1461 °C | 2720 °C | Solid | 8.79 g/cm3 | Metal |
|
|
|
| General |
| Name, Symbol, Number |
holmium, Ho, 67 |
| Chemical series |
lanthanides |
| Group, Period, Block |
n/a, 6, f |
| Appearance |
silvery white
 |
| Standard atomic weight |
164.93032(2) g·mol−1 |
| Electron configuration |
[Xe] 4f11 6s2 |
| Electrons per shell |
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 |
| Heat capacity |
(25 °C) 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 |
| Crystal structure |
hexagonal |
| Oxidation states |
3
(basic oxide) |
| Electronegativity |
1.23 (scale Pauling) |
Ionization energies
(more) |
1st: 581.0 kJ·mol−1 |
| 2nd: 1140 kJ·mol−1 |
| 3rd: 2204 kJ·mol−1 |
| Atomic radius |
175 pm |
| Miscellaneous |
| Magnetic ordering |
paramagnetic |
| Electrical resistivity |
(r.t.) (poly) 814 nΩ·m |
| Thermal conductivity |
(300 K) 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 |
| 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 |
| Selected isotopes |
|
|
| References |
|
Holmium Compounds
|
Source: Wikipedia article Holmium
|
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Chemistry Quick Facts
