Einsteinium

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Einsteinium,  99Es
Quartz vial (9 mm diameter) conteenin ~300 micrograms o solit 253Es. The illumination produced is a result o the intense radiation frae 253Es.
General properties
Appearance siller-coloured
Mass nummer 252 (most stable isotope)
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
Group group n/a
Period period 7
Element category   actinide
Block f-block
Electron confeeguration [Rn] 5f11 7s2
Electrons per shell
2, 8, 18, 32, 29, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1133 K ​(860 °C, ​1580 °F)
Bylin pynt 1269 K ​(996 °C, ​1825 °F) (estimatit)
Density (near r.t.) 8.84 g/cm3
Atomic properties
Oxidation states 2, 3, 4
Electronegativity Pauling scale: 1.3
Ionisation energies
  • 1st: 619 kJ/mol
Coloyr lines in a spectral range
Spectral lines o Einsteinium
Miscellanea
Creestal structurface-centred cubic (fcc)
Face-centered cubic creestal structur for einsteinium
Magnetic orderin paramagnetic
CAS Nummer 7429-92-7
History
Namin after Albert Einstein
Diskivery Lawrence 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 | in Wikidata

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