holmium
Sign in to saveHolmium is a chemical element; it has symbol Ho and atomic number 67. It is a rare-earth element and the eleventh member of the lanthanide series of elements. It is a relatively soft, silvery, fairly corrosion-resistant and malleable metal. Like many other lanthanides, holmium is too reactive to be found in native form, as pure holmium slowly forms a yellowish oxide coating when exposed to air. When isolated, holmium is relatively stable in dry air at room temperature. However, it reacts with water and corrodes readily, and also burns in air when heated.
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Holmium is a rare-earth metal element (symbol Ho, atomic number 67) that is silvery, soft, and somewhat resistant to corrosion, but it's so chemically reactive that it doesn't occur naturally in pure form and will slowly develop a yellowish coating when exposed to air. While it remains fairly stable in dry air at room temperature, holmium readily reacts with water, corrodes easily, and can burn when heated.
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Research
5,441 papers- Holmium-166 Microsphere Radioembolization of Hepatic Malignancies.Seminars in nuclear medicine · 2019
- Holmium-166 Radioembolization: Current Status and Future Prospective.Cardiovascular and interventional radiology · 2022
- Holmium:yttrium-aluminum-garnet laser prostatectomy.Mayo Clinic proceedings · 1998
- Holmium laser prostatectomy.Current urology reports · 2001
- Holmium laser enucleation versus bipolar transurethral enucleation for treating benign prostatic hyperplasia, which one is better?The aging male : the official journal of the International Society for the Study of the Aging Male · 2021
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Article
18 sectionsContents
- Properties
- Physical properties
- Chemical properties
- Oxidation states
- Isotopes
- Compounds
- Oxides and chalcogenides
- Halides
- Organoholmium compounds
- History
- Occurrence and production
- Applications
- Biological role and precautions
- See also
- References
- Bibliography
- Further reading
- External links
Holmium is a chemical element; it has symbol Ho and atomic number 67. It is a rare-earth element and the eleventh member of the lanthanide series of elements. It is a relatively soft, silvery, fairly corrosion-resistant and malleable metal. Like many other lanthanides, holmium is too reactive to be found in native form, as pure holmium slowly forms a yellowish oxide coating when exposed to air. When isolated, holmium is relatively stable in dry air at room temperature. However, it reacts with water and corrodes readily, and also burns in air when heated.
In nature, holmium occurs together with the other rare-earth metals (like thulium). It is a relatively rare lanthanide, making up 1.4 parts per million of the Earth's crust, an abundance similar to tungsten. Holmium was discovered through isolation by Swedish chemist Per Theodor Cleve. It was also independently discovered by Jacques-Louis Soret and Marc Delafontaine, who together observed it spectroscopically in 1878. Its oxide was first isolated from rare-earth ores by Cleve in 1878. The element's name comes from Holmia, the Latin name for the city of Stockholm.