Relative atomic mass: 164.93032 +- 0.00002

English: Holmium
French: Holmium
Croatian: Holmij
German: Holmium
Italian: Olmio
Spanish: Holmio

Atomic number: 67
Group numbers: 3
Period: 6
Standard state (20 oC): solid

Discovery: 1879 Per Theodor Cleve (SE)
Holmium was discovered by Per Theodore Cleve (SE) in 1879. The origin of the name comes from the Greek word Holmia meaning Stockholm. It is a fairly soft, malleable, lustrous, silvery metal that reacts slowly with oxygen and water. Holmium dissolves in acids and is able to react violently with air or halogens. Holmium occurs in gadolinite but most often it's produced from monazite sand. It has very few practical applications; however, it has some unusual magnetic properties that offer some hope for future applications. The price of 99.9 % pure holmium pieces is 348.50 for 25 g.
Electronic configuration: [Xe] 4f11 6s2
Formal oxidation number: +3
Atomic radius: 174.3 pm

Electronegativities: 1.23
Thermal conductivity: 16.2 W/(m K)
Electrical resistivity (20 oC): 87 microOhm cm

Melting point: 1474 oC
Boiling point: 2700 oC

Heat of fusion: 17.2 kJ/mol
Heat of vaporization: 303 kJ/mol
Heat of atomization: 302.63 kJ/mol

66Dy <= 67Ho => 68Er

ASCII Periodic Table of the Elements
6 Jan. 2020
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