Americium

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Americium,  95Am
Americium microscope.jpg
General properties
Appearance sillery white
Mass nummer 243 (most stable isotope)
Americium 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 Gold 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
Eu

Am

(Uqs)
plutoniumamericiumcurium
Atomic nummer (Z) 95
Group group n/a
Period period 7
Element category   actinide
Block f-block
Electron confeeguration [Rn] 5f7 7s2
Electrons per shell
2, 8, 18, 32, 25, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1449 K ​(1176 °C, ​2149 °F)
Bylin pynt 2880 K ​(2607 °C, ​4725 °F) (calculatit)
Density (near r.t.) 12 g/cm3
Heat o fusion 14.39 kJ/mol
Molar heat capacity 62.7 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1239 1356
Atomic properties
Oxidation states 8, 7, 6, 5, 4, 3, 2 ​(an amphoteric oxide)
Electronegativity Pauling scale: 1.3
Ionisation energies
  • 1st: 578 kJ/mol
Atomic radius empirical: 173 pm
Covalent radius 180±6 pm
Color lines in a spectral range
Miscellanea
Creestal structur ​dooble hexagonal close packed
[[File:dooble hexagonal close packed|50px|alt=Dooble hexagonal close packed creestal structur for americium|Dooble hexagonal close packed creestal structur for americium]]
Thermal conductivity 10 W/(m·K)
Electrical resistivity 0.69 µΩ·m[1]
Magnetic orderin paramagnetic
CAS Nummer 7440-35-9
History
Namin efter the Americas
Diskivery Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso (1944)
Main isotopes o americium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
241Am syn 432.2 y SF
α 5.486 237Np
242mAm syn 141 y IT 0.049 242Am
α 5.637 238Np
SF
243Am syn 7370 y SF
α 5.275 239Np
| references | in Wikidata

Americium is a radioactive transuranic chemical element wi seembol Am an atomic nummer 95.

References[eedit | eedit soorce]

  1. Muller, W.; Schenkel, R.; Schmidt, H. E.; Spirlet, J. C.; McElroy, D. L.; Hall, R. O. A.; Mortimer, M. J. (1978). "The electrical resistivity and specific heat of americium metal". Journal of Low Temperature Physics. 30 (5–6): 561. Bibcode:1978JLTP...30..561M. doi:10.1007/BF00116197.