Template:Infobox holmium

Holmium,  ₆₇Ho

General properties
Name, symbol	holmium, Ho
Appearance	silvery white
Pronunciation	/ˈhoʊlmiəm/ HOHL-mee-əm
Holmium in the periodic table
– ↑ Ho ↓ Es dysprosium ← holmium → erbium
Atomic number (Z)	67
Group, block	group n/a, f-block
Period	period 6
Element category	lanthanide
Standard atomic weight (±) (Ar)	164.93033(2)
Electron configuration	[Xe] 4f11 6s2
per shell	2, 8, 18, 29, 8, 2
Physical properties
Phase	solid
Melting point	1734 K ​(1461 °C, ​2662 °F)
Boiling point	2873 K ​(2600 °C, ​4712 °F)
Density near r.t.	8.79 g/cm3
when liquid, at m.p.	8.34 g/cm3
Heat of fusion	17.0 kJ/mol
Heat of vaporization	251 kJ/mol
Molar heat capacity	27.15 J/(mol·K)
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 ​(a basic oxide)
Electronegativity	Pauling scale: 1.23
Ionization energies	1st: 581.0 kJ/mol 2nd: 1140 kJ/mol 3rd: 2204 kJ/mol
Atomic radius	empirical: 176 pm
Covalent radius	192±7 pm
Miscellanea
Crystal structure	​hexagonal close-packed (hcp)
Speed of sound thin rod	2760 m/s (at 20 °C)
Thermal expansion	poly: 11.2 µm/(m·K) (at r.t.)
Thermal conductivity	16.2 W/(m·K)
Electrical resistivity	poly: 814 nΩ·m (at r.t.)
Magnetic ordering	paramagnetic
Young's modulus	64.8 GPa
Shear modulus	26.3 GPa
Bulk modulus	40.2 GPa
Poisson ratio	0.231
Vickers hardness	410–600 MPa
Brinell hardness	500–1250 MPa
CAS Number	7440-60-0
History
Discovery	Marc Delafontaine (1878)
Most stable isotopes of holmium
iso NA half-life DM DE (MeV) DP 163Ho syn 4570 y ε 0.003 163Dy 164Ho syn 29 min ε 0.987 164Dy 165Ho 100% – (α) 0.1394 161Tb 166Ho syn 26.763 h β− 1.855 166Er 167Ho syn 3.1 h β− 1.007 167Er
Decay modes in parentheses are predicted, but have not yet been observed

References

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