Europium

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Europium,  63Eu
Europium.jpg
General properties
Name, seembol europium, Eu
Pronunciation /jʊˈrpiəm/
ew-ROH-pee-əm
Appearance sillery white, but rarely seen wioot oxide discolouration
Europium 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)
Iron (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Copper (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)
Silver (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)
Mercury (transeetion metal)
Thallium (post-transeetion metal)
Lead (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)
-

Eu

Am
samariumeuropiumgadolinium
Atomic nummer 63
Staundart atomic wicht (Ar) 151.964
Element category   lanthanide
Group, block group n/a, f-block
Period period 6
Electron configuration [Xe] 4f7 6s2
per shell
2, 8, 18, 25, 8, 2
Pheesical properties
Phase solid
Meltin pynt 1099 K ​(826 °C, ​1519 °F)
Boilin pynt 1802 K ​(1529 °C, ​2784 °F)
Density near r.t. 5.264 g/cm3
when liquid, at m.p. 5.13 g/cm3
Heat o fusion 9.21 kJ/mol
Heat o 176 kJ/mol
Molar heat capacity 27.66 J/(mol·K)
 pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 863 957 1072 1234 1452 1796
Atomic properties
Oxidation states

3, 2, 1

(mildly basic oxide)
Electronegativity Pauling scale: ? 1.2
Atomic radius empirical: 180 pm
Covalent radius 198±6 pm
Miscellanea
Crystal structur body-centered cubic (bcc)
Body-centered cubic crystal structure for europium
Thermal expansion (r.t.) (poly)
35.0 µm/(m·K)
Thermal conductivity est. 13.9 W/(m·K)
Electrical resistivity (r.t.) (poly) 0.900 µ Ω·m
Magnetic orderin paramagnetic[1]
Young's modulus 18.2 GPa
Shear modulus 7.9 GPa
Bulk modulus 8.3 GPa
Poisson ratio 0.152
Vickers haurdness 167 MPa
CAS Registry Nummer 7440-53-1
History
Discovery Eugène-Anatole Demarçay (1896)
First isolation Eugène-Anatole Demarçay (1901)
Maist stable isotopes
Main article: Isotopes o europium
iso NA hauf-life DM DE (MeV) DP
150Eu syn 36.9 y ε 2.261 150Sm
151Eu 47.8% 5×1018 y α 1.9644 147Pm
152Eu syn 13.516 y ε 1.874 152Sm
β 1.819 152Gd
153Eu 52.2% - (α) 0.2736 149Pm
Decay modes in parentheses are predicted, but have not yet been observed
· references

Europium is a chemical element wi the seembol Eu an atomic nummer 63. It is named efter the continent Europe. It is a moderately haird, sillery metal which readily oxidizes in air an watter. Bein a typical member o the lanthanide series, europium uisually assumes the oxidation state +3, but the oxidation state +2 is an aa common: aw europium compoonds wi oxidation state +2 are slichtly reducing. Europium haes na signeeficant biological role an is relatively non-toxic compared tae ither hivy metals. Maist applications o europium exploit the phosphorescence o europium compoonds.

References[eedit | eedit soorce]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.