CAS Number7440-69-9
PubChem CID5359367
Atomic Radius156
Atomic Volume21.3
Atomic Weight208.98
Boiling Point1,564
Bulk Modulus
CategoryPost-transition metals
Crystal StructureBase Centered Monoclinic
Covalent Radius148
Electrical Resistivity
Electron Configuration[Xe] 4f14 5d10 6s2 6p3
Electrons per shell2, 8, 18, 32, 18, 5
Heat of Fusion10.9
Heat of Vaporization160
Ionization Potential7.286
Magnetic Ordering
Magnetic Susceptibility
Mass Number83
Melting Point271.5
Atomic Number209
Oxidation States-3, 3, 5
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.122
Thermal Conductivity0.08
Van der Waals radius
Young's Modulus
Abundance in Earth's crust2.5×10-6%
Abundance in Universe7×10-8%
Bi ബിസ്മത് 83 208.9804 15 6 p 83 271.0 1560.0 [Xe] 4f14 5d10 6s2 6p3 2 8 18 32 18 5 9.75 2.5E-6% Gray Rhombohedral 2.0 2.01 {"1":"703","2":"1610","3":"2466","4":"4370","5":"5400","6":"8520"} 711 91.2 170 +3,5 1.7 21.3 11.0 179.0 0.122 7.87 0 1.9×101919y AlphaEmission Solid, Diamagnetic, Conductor, Metal, Stable, Natural, PoorMetal BIZ-meth Hard, brittle, steel-gray metal with a pink tint. Main use is in pharmaceuticals and low melting point alloys used as fuses. It can be found free in nature and in minerals like bismuthine (Bi2O3) and in bismuth ochre (Bi2O3) jUHN9a1zNA4 Bismuth
Erbium was discovered in 1843 by Swedish chemist Carl Gustaf Mosander, who detected it as an impurity in yttria.

Using ammonium hydroxide he precipitated fractions of different basicity from yttria.

In these fractions he found that the fraction that contained the pink color was erbium. Erbium was named after Ytterby, a town in Sweden 83 From the German word "bisemutum"

Isotopes of Erbium

Standard Atomic Weight


Stable Isotopes


Unstable Isotopes

184Bi 185Bi 186Bi 187Bi 188Bi 189Bi 190Bi 191Bi 192Bi 193Bi 194Bi 195Bi 196Bi 197Bi 198Bi 199Bi 200Bi 201Bi 202Bi 203Bi 204Bi 205Bi 206Bi 207Bi 208Bi 210Bi 211Bi 212Bi 213Bi 214Bi 215Bi 216Bi 217Bi 218Bi

Erbium is considered to be moderately toxic
The highest concentration of erbium in humans is in the bones
Erbium is used in photographic filters to absorb infrared light.

Erbium oxide gives a pink color and has been used as a colorant in glasses and porcelain enamel glazes.

It is also used in nuclear technology in neutron-absorbing control rods.

Erbium is used in alloys especially with vanadium to decrease the hardness of metals.