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Dysprosium,  66Dy
Dy chips.jpg
General properties
Name, seembol dysprosium, Dy
Appearance sillery white
Pronunciation /dɪsˈprziəm/
Dysprosium in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Siller (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer (Z) 66
Group, block group n/a, f-block
Period period 6
Element category   lanthanide
Staundart atomic wicht (Ar) 162.500
Electron configuration [Xe] 4f10 6s2
per shell
2, 8, 18, 28, 8, 2
Pheesical properties
Phase solid
Meltin pynt 1680 K ​(1407 °C, ​2565 °F)
Bylin pynt 2840 K ​(2562 °C, ​4653 °F)
Density near r.t. 8.540 g/cm3
when liquid, at m.p. 8.37 g/cm3
Heat o fusion 11.06 kJ/mol
Heat o vapourisation 280 kJ/mol
Molar heat capacity 27.7 J/(mol·K)
vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1378 1523 (1704) (1954) (2304) (2831)
Atomic properties
Oxidation states

3, 2, 1

(weakly basic oxide)
Electronegativity Pauling scale: 1.22
Atomic radius empirical: 178 pm
Covalent radius 192±7 pm
Crystal structur hexagonal close-packed (hcp)
Hexagonal close packed crystal structur for dysprosium
Speed o soond thin rod 2710 m/s (at 20 °C)
Thermal expansion (r.t.) (α, poly) 9.9 µm/(m·K)
Thermal conductivity 10.7 W/(m·K)
Electrical resistivity (r.t.) (α, poly) 926 n Ω·m
Magnetic orderin paramagnetic at 300 K
Young's modulus (α form) 61.4 GPa
Shear modulus (α form) 24.7 GPa
Bulk modulus (α form) 40.5 GPa
Poisson ratio (α form) 0.247
Vickers haurdness 540 MPa
Brinell haurdness 500 MPa
CAS Nummer 7429-91-6
Discovery Lecoq de Boisbaudran (1886)
Maist stable isotopes o dysprosium
iso NA hauf-life DM DE (MeV) DP
154Dy syn 3.0×106 y α 2.947 150Gd
156Dy 0.06% >1×1018 y α 2.0108 152Gd
β+β+ 1.7579 156Gd
158Dy 0.10% 158Dy is stable wi 92 neutrons
160Dy 2.34% 160Dy is stable wi 94 neutrons
161Dy 18.91% 161Dy is stable wi 95 neutrons
162Dy 25.51% 162Dy is stable wi 96 neutrons
163Dy 24.90% 163Dy is stable wi 97 neutrons
164Dy 28.18% 164Dy is stable wi 98 neutrons
· references

Dysprosium is a chemical element wi the seembol Dy an atomic nummer 66. It is a rare yird element wi a metallic siller luster. Dysprosium is never foond in naitur as a free element, tho it is foond in various minerals, such as xenotime. Naiturally occurrin dysprosium is componed o 7 isotopes, the maist abundant o which is 164Dy.

Dysprosium wis first identified in 1886 bi Paul Émile Lecoq de Boisbaudran, but wis nae isolatit in pur fairm till the development o ion exchange techniques in the 1950s. Dysprosium is uised for its heich thermal neutron absorption cross-section in makin control rods in nuclear reactors, for its heich magnetic susceptibility in data storage applications, an as a component o Terfenol-D. Soluble dysprosium salts are mildly toxic, while the insoluble salts are considered non-toxic.

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