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Description

Holmium · CAS 7440-60-0 · Ho. UNII W1XX32SQN1. Boiling Point: 2720 °C @760 [mm Hg]; Density: 8.78 @25 °C; Vapor Pressure: 2 [mm Hg] @1630 °C.

Identification

CAS Registry Number	7440-60-0
PubChem CID	23988
Molecular formula	Ho
IUPAC name	holmium
UNII (FDA)	W1XX32SQN1

Computed Descriptors

Molecular Weight	164.93033
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	0
Exact Mass	164.930329
Monoisotopic Mass	164.930329
Topological Polar Surface Area	0
Heavy Atom Count	1
Formal Charge	0
Complexity	0

Physical & Chemical Properties

Boiling Point	2720 °C @760 [mm Hg]
Density	8.78 @25 °C
Vapor Pressure	2 [mm Hg] @1630 °C

Physical description & handling notes

• Metal; Crystals; Yellow-green salts; [Merck Index] Soft and malleable, bright-silver metal; oxidizes in moist air and elevated temperature; [Reference #1]

Regulatory Status

GHS notification summary	8% (4 / 50)

GHS Hazard Classification

GHS notification summary	8% (4 / 50)
Reported hazard statements	H228 (84%)

Documented Uses

• Source: Rare earth minerals; Comprises about 0.05% of monazite; [Reference #1] Uses: Getter in vacuum tubes, research, spectroscopy; [Hawley]

Synonyms

HOLMIUM; 7440-60-0; W1XX32SQN1; DTXSID3064699; Holmium Metallicum; RefChem:58721; DTXCID0047664; 231-169-0; HOLMIUM ATOM; MFCD00011049; Holmium foil; Holmium-165; Holmium Standard: Ho @ 1000 microg/mL in 5% HNO3; Holmium Standard: Ho @ 10000 microg/mL in 5% HNO3; holmio; Holmium element

Frequently Asked Questions

What are the CAS number and molecular formula of Holmium?

CAS 7440-60-0; molecular formula Ho; molecular weight — g/mol.

What other names is Holmium known by?

HOLMIUM, 7440-60-0, W1XX32SQN1, DTXSID3064699, Holmium Metallicum, RefChem:58721.

Is Holmium classified as hazardous?

8% of GHS notifications report no hazard classification (4 of 50).

What are the key physical properties of Holmium?

Boiling Point: 2720 °C @760 [mm Hg]; Density: 8.78 @25 °C; Vapor Pressure: 2 [mm Hg] @1630 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.