Actinium

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Actinium,  89Ac
General properties
Appearance sillery-white, glowin wi an eerie blue licht;[1] sometimes with a golden cast[2]
Mass nummer 227 (most stable isotope)
Actinium 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
La

Ac

(Uqu)
radiumactiniumthorium
Atomic nummer (Z) 89
Group group 3
Period period 7
Element category   actinide
Block f-block
Electron confeeguration [Rn] 6d1 7s2
Electrons per shell
2, 8, 18, 32, 18, 9, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1500 K ​(1227 °C, ​2240 °F) (estimatit)[2]
Bylin pynt 3500±300 K ​(3200±300 °C, ​5800±500 °F) (extrapolatit)[2]
Density (near r.t.) 10 g/cm3
Heat o fusion 14 kJ/mol
Heat o vapourisation 400 kJ/mol
Molar heat capacity 27.2 J/(mol·K)
Atomic properties
Oxidation states 3, 2 ​(a neutral oxide)
Electronegativity Pauling scale: 1.1
Ionisation energies
  • 1st: 499 kJ/mol
  • 2nd: 1170 kJ/mol
Covalent radius 215 pm
Color lines in a spectral range
Miscellanea
Creestal structur ​face-centred cubic
[[File:face-centred cubic|50px|alt=Face-centred cubic creestal structur for actinium|Face-centred cubic creestal structur for actinium]]
Thermal conductivity 12 W/(m·K)
CAS Nummer 7440-34-8
History
Diskivery an first isolation Friedrich Oskar Giesel (1902)
Main isotopes o actinium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
225Ac trace 10 d α 221Fr
226Ac syn 29.37 h β 1.117 226Th
ε 0.640 226Ra
α 5.536 222Fr
227Ac trace 21.772 y β 0.045 227Th
α 5.042 223Fr
| references | in Wikidata

Actinium is a radioactive chemical element wi seembol Ac (nae tae be confused wi the abbreviation for an acetyl group) an atomic nummer 89, which wis discovered in 1899.

References[eedit | eedit soorce]

  1. Wall, Greg (8 September 2003). "C&EN: It's Elemental: The Periodic Table - Actinium". C&EN: It's Elemental: The Periodic Table. Chemical and Engineering News. Retrieved 2 Juin 2011. 
  2. 2.0 2.1 2.2 Kirby, Harold W.; Morss, Lester R. (2006). "Actinium". The Chemistry of the Actinide and Transactinide Elements. p. 18. doi:10.1007/1-4020-3598-5_2. ISBN 978-1-4020-3555-5.