هولميوم (په انگرېزي: Holmium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Ho سمبول او ۶v اتمي شمېرې په وسیله ښودل شوی دی.
Holmium, 67Ho |
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| Pronunciation | /ˈhəʊlmiəm/
HOHL-mee-əm |
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| Appearance | silvery white |
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| اټومي شمیره (Z) | 67 |
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| گروپ, پیریود | group n/a, period 6 |
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| بلاک | f-block |
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| Element category | lanthanide |
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| معياري اټومي وزن (Ar) | کينډۍ:Val[۱] |
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| Electron configuration | [Xe] 4f11 6s2 |
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Electrons per shell | 2, 8, 18, 29, 8, 2 |
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| حالت (at STP) | جامد |
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| دويلې کيدو ټکى | 1734 K (1461 °C, 2662 °F) |
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| يشنا ټکی | 2873 K (2600 °C, 4712 °F) |
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| Density near r.t. | 8.79 g/cm3 |
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| when liquid, at m.p. | 8.34 g/cm3 |
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| Heat of fusion | 17.0 kJ/mol |
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| Heat of vaporization | 251 kJ/mol |
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| Molar heat capacity | 27.15 J/(mol·K) |
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Vapor pressure
| P (Pa)
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1
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10
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100
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1 k
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10 k
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100 k
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| at T (K)
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1432
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1584
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(1775)
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(2040)
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(2410)
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(2964)
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| Oxidation states | 3, 2, 1 (a basic oxide) |
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| Electronegativity | Pauling scale: 1.23 |
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| Ionization energies | - 1st: 581.0 kJ/mol
- 2nd: 1140 kJ/mol
- 3rd: 2204 kJ/mol
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| Atomic radius | empirical: 176 pm |
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| Covalent radius | 192±7 pm |
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| Crystal structure | hexagonal close-packed (hcp) Hexagonal close packed crystal structure for holmium |
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| Speed of sound thin rod | 2760 m/s (at 20 °C) |
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| Thermal expansion | poly: 11.2 µm/(m·K) (at r.t.) |
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| د تودوخې تېرېدنه | 16.2 W/(m·K) |
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| Electrical resistivity | poly: 814 nΩ·m (at r.t.) |
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| Magnetic ordering | paramagnetic |
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| Young's modulus | 64.8 GPa |
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| Shear modulus | 26.3 GPa |
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| Bulk modulus | 40.2 GPa |
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| Poisson ratio | 0.231 |
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| Vickers hardness | 410–600 MPa |
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| Brinell hardness | 500–1250 MPa |
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| CAS Number | 7440-60-0 |
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| Discovery | Jacques-Louis Soret (1878) |
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| | references | in Wikidata |
