Ang holmyo (Iningles holmium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ho ug kaiphan nga atomik 67. Ang holmyo mao ang puthaw nga lantanido.
Quick facts Holmium, Panagway ...
| Holmium |
|---|
67Ho |
|
|
| Panagway |
silvery white
 |
| Kinatibuk-ang mga kinaiya |
| Ngalan, simbolo, kaiphan |
holmium, Ho, 67 |
| Paglitok |
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-mee-əm]] |
| Kategoriyang elemento |
puthaw nga lantanido |
| Group, period, block |
n/a, 6, f |
| Gibug-aton sa atomo |
164.93032 |
| Kontorno sa elektron |
[Xe] 4f11 6s2
2, 8, 18, 29, 8, 2
 Electron shells of holmium (2, 8, 18, 29, 8, 2) |
| History |
| Pagkadiskobre |
Marc Delafontaine (1878) |
| Physical properties |
| Phase |
magahi |
| 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, 2, 1
(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 |
| Most stable isotopes |
| Main article: Isotopes of 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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