Holmium

Images

Image

Attribution: images-of-elements.com

Animated Holmium

History

From the Latin word Holmia meaning Stockholm. The special absorption bands of holmium were noticed in 1878 by the Swiss chemists Delafontaine and Soret, who announced the existence of an "Element X." Cleve, of Sweden, later independently discovered the element while working on erbia earth. The element is named after Cleve's native city. Holmia, the yellow oxide, was prepared by Homberg in 1911. Holmium occurs in gadolinite, monazite, and in other rare-earth minerals. It is commercially obtained from monazite, occurring in that mineral to the extent of about 0.05%. It has been isolated by the reduction of its anhydrous chloride or fluoride with calcium metal.

General Info

AtomicNumber
67
Symbol
Ho
Name
Holmium

Atomic Info

Appearance
AtomicWeight
164.93032(2)
Color
00FF9C
ElectronicConfiguration
[Xe] 4f11 6s2
ElectronegativityInPauling
1.23
AtomicRadiusInPM
IonRadiusInPM
90.1 (+3)
VanDerWaalsRadiusInPM
IEinKJmol
581
EAinKJmol
-50
OxidationStates
3
StandardState
solid
BondingType
metallic
MeltingPoint
1747
BoilingPoint
2973
Density
8.8
State
Lanthanide
DiscoveredYear
1878