|
}
Dy occurs as chemical element in the periodic table that has the symbol Dy & atomic number 66.
Notable characteristics
Dy occurs as rare earth element that has a metal, brightly silver luster, comparatively stable around air at room temperature, however dissolving readily within diluted or even concentrated mineral acids with a emission of hydrogen. These are easy plenty to exist as cut by owning the knife, & may be machined forswearing sparking whenever overheating is avoided. Dy's characteristics may be greatly affected potentially by microscopic numbers of impurities.
Applications
Dy is utilized, within conjunction by having vanadium and other elements, for making laser materials; its high thermal neutron absorption cross-section & melting point besides indicate utilizing it for nuclear control rods, dysprosium oxide (likewise referred to as dysprosia) by having nickel cement compounds which absorb neutrons readily forgoing swelling or even catching under prolonged neutron bombardment, is existence utilized for cooling rods within nuclear reactors. Dysprosium-cadmium chalcogenides are sources of infrared radiation for studying reaction; what is more, atomic number 66 is utilized for manufacturing compact discs.
History
Dy was number one identified within Paris in 1886 by French chemist Paul Émile Lecoq de Boisbaudran; however, a element itself was does'nt isolated within comparatively pure form until fallowing a development of ion exchange and metallographic reduction techniques in the 1950s. A title dy is from either Greek dysprositos, "hard to get at".
Occurrence
Atomic number 66 is never detected when a loose element, however is found inside several minerals, including xenotime, fergusonite, gadolinite, euxenite, polycrase, blomstrandine, monazite and bastnasite, often by owning erbium and holmium or other uncommon globe elements.
Compounds
100% atomic number 66 compounds come in the +3 oxidation number, & come extremely paramagnetic. Atomic number 66 compounds include:
Fluorides
DyF3
Chlorides
DyCl2
DyCl3
Bromides
DyBr2
DyBr3
Iodides
DyI2
DyI3
Oxides
Dy2O3
Sulfides
Dy2S3
Nitrides
DyN
Isotopes
Naturally occurring dy is composed of Septet stable isotopes, 156-Dy, 158-Dy, 160-Dy, 161-Dy, 162-Dy, 163-Dy and 164-Dy, using 164-Dy existence a virtually all abundant (Xxviii.18% natural abundance). Twenty-eight radioisotopes have been characterized, by having the virtually all horse barn existence 154-Dy with a half-life of 3.0E+6 years, 159-Dy by owning the half-life of Gross.Quadruplet years, & 166-Dy by owning the half-life of 81.Six hours. Tons of the left over radioactive isotopes keep close at hand half-lifes that come less than Ten hours, & a majority one have half lifes that come less than Xxx seconds. This element likewise has Pentad meta states, with a virtually all stalls existence 165m-Dy (t½ Single.257 transactions), 147m-Dy (t½ 55.Septet seconds) & 145m-Dy (t½ Long dozen.Sextet seconds).
A primary decay mode before the virtually all abundant stable isotope, 164-Dy, is electron capture, and a primary mode when is beta minus decay. A primary decay products before 164-Dy come terbium isotopes, and a primary products fallowing come holmium isotopes.
Precautions
When using a more rcome-earth element, atomic number 66 compounds are of sale to moderate toxicity, although their toxicity has not been investigated within detail. Dy doesn't use any known biological properties.
|
