Holmium

Metal

Symbol: Ho
Atomic number: 67
Atomic mass: 164.93032
Group: Lanthanide
CAS-number: 7440-60-0

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Electronic data

Shells: 2, 8, 18, 29, 8, 2
Orbitals: [Xe] 4f¹¹ 6s²
Electronegativity: --, 1.1
1. Ionization potential: 6.0216 eV
2. Ionization potential: 11.805 eV
3. Ionization potential: 22.843 eV
Oxidation states: 3
Electrical conductivity: 0.0124 10^6

Thermal data

Melting point: 1474 °C
Boiling point: 2700 °C
Specific heat: 0.16 J/gK
Heat of fusion: 12.20 kJ/mol
Heat of vaporization: 241.0 kJ/mol
Thermal conductivity: 0.162 W/cmK

Steric data

Atomic radius: 2.47 Å
Ionic radius: -- Å
Covalent radius: 1.58 Å
Atomic volume: 18.7 cm³/mol
Density (293 K): 8.80 g/cm³
Crystal structure: hexagonal

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
¹⁶³Ho	0	163	7/2	4.57E03y	EC	View
¹⁶⁵Ho	100	164.93	7/2	--	--
¹⁶⁶Ho	0	166	0	1.117d	β-	View
¹⁶⁶Hom	0	166	7	1.2E03y	β-	View

Name origin:	From Holmia, the Latinized name for Stockholm, Sweden.
Description:	Fairly soft, malleable, lustrous, silvery metal.
Discovered by:	J.L. Soret
Year:	1878
Place:	Switzerland
Sources:	Occurs in gadolinite. Most often from monazite which is often 50% rare earth and typically 0.05% holmium.
Use(s):	It has very few practical applications; however, it has some unusual magnetic properties that offer some hope for future applications.

Holmium

Physical data

Electronic data

Thermal data

Steric data

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