CAS Number7440-28-0
PubChem CID5359464
Atomic Radius170
Atomic Volume17.2
Atomic Weight204.383
Boiling Point1,473
Bulk Modulus
CategoryPost-transition metals
Crystal StructureSimple Hexagonal
Covalent Radius145
Electrical Resistivity
Electron Configuration[Xe] 4f14 5d10 6s2 6p1
Electrons per shell2, 8, 18, 32, 18, 3
Heat of Fusion4.2
Heat of Vaporization165
Ionization Potential6.108
Magnetic Ordering
Magnetic Susceptibility
Mass Number81
Melting Point304
Atomic Number204
Oxidation States1, 3
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.129
Thermal Conductivity0.461
Van der Waals radius
Young's Modulus
Abundance in Earth's crust0.000053%
Abundance in Universe5×10-8%
Tl Thallium 81 204.3833 13 6 p 81 303.0 1457.0 [Xe] 4f14 5d10 6s2 6p1 2 8 18 32 18 3 11.9 0.000053% Silver Hexagonal 1.6 1.789 {"1":"589.4","2":"1971","3":"2878"} 589 19.2 171 +1,3 1.71 17.2 4.27 162.09 0.129 46.1 0 Solid, Diamagnetic, Conductor, Metal, Stable, Natural, PoorMetal THAL-i-em Soft gray metal that looks like lead. Its compounds are used in rat and ant poisons. Also for detecting infrared radiation. Found in iron pyrites. Also in crookesite, hutchinsonite and lorandite. Most is recovered from the byproducts of lead and zinc refining. bK6nnyibhdk Thallium
French chemist Paul Émile Lecoq de Boisbaudran, while working with holmium oxide, separated dysprosium oxide from it in Paris in 1886.

His procedure for isolating the dysprosium involved dissolving dysprosium oxide in acid, then adding ammonia to precipitate the hydroxide.

It was not isolated in pure form until the development of ion exchange techniques in the 1950s. From the Greek word dysprositos, meaning hard to get at 81 1861 Sir William Crookes England From the Greek word "thallos" meaning "green twig" or green shoot

Isotopes of Dysprosium

Standard Atomic Weight


Stable Isotopes

203Tl 205Tl

Unstable Isotopes

176Tl 177Tl 178Tl 179Tl 180Tl 181Tl 182Tl 183Tl 184Tl 185Tl 186Tl 187Tl 188Tl 189Tl 190Tl 191Tl 192Tl 193Tl 194Tl 195Tl 196Tl 197Tl 198Tl 199Tl 200Tl 201Tl 202Tl 204Tl 206Tl 207Tl 208Tl 209Tl 210Tl 211Tl 212Tl

Dysprosium is considered to be moderately toxic
Naturally occurring dysprosium is composed of 7 isotopes
Dysprosium oxide-nickel cermets are used in neutron-absorbing control rods in nuclear reactors.

Dysprosium is used in data storage applications such as compact discs and hard discs.

It is also used in dosimeters for measuring ionizing radiation.

Dysprosium iodide and dysprosium bromide are used in high intensity metal-halide lamps.