Einsteinium is a synthetic element wi seembol Es an atomic nummer 99.

Einsteinium, 99Es
Template:Infobox element/symbol-to-top-image/alt
Einsteinium
Pronunciation/nˈstniəm/ (eyen-STY-nee-əm)
Appearancesiller-coloured
Mass numberEs: [252]
Einsteinium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Ho

Es

(Upu)
californiumeinsteiniumfermium
Atomic nummer (Z)99
Groupgroup n/a
Periodperiod 7
Blockf-block
Element category  Actinide
Electron confeeguration[Rn] 5f11 7s2
Electrons per shell2, 8, 18, 32, 29, 8, 2
Pheesical properties
Phase at STPsolit
Meltin pynt1133 K ​(860 °C, ​1580 °F)
Bylin pynt1269 K ​(996 °C, ​1825 °F) (estimatit)
Density (near r.t.)8.84 g/cm3
Atomic properties
Oxidation states+2, +3, +4
ElectronegativityPauling scale: 1.3
Ionisation energies
  • 1st: 619 kJ/mol
Colour lines in a spectral range
Spectral lines o einsteinium
Ither properties
Naitural occurrenceEs: Synthetic
Creestal structurface-centred cubic (fcc)
Face-centered cubic creestal structur for einsteinium
Magnetic orderinparamagnetic
CAS Nummer7429-92-7
History
Naminafter Albert Einstein
DiskiveryLawrence Berkeley Naitional Laboratory (1952)
Main isotopes o einsteinium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 252Es syn 471.7 d α 248Bk
ε 252Cf
β 252Fm
253Es syn 20.47 d SF
α 249Bk 254Es syn 275.7 d ε 254Cf
β 254Fm
α 250Bk 255Es syn 39.8 d β 255Fm
α 251Bk
SF
| references