Actinium

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Actinium,  89Ac
General properties
Name, seembol actinium, Ac
Appearance sillery-white, glowin wi an eerie blue licht;[1] sometimes with a golden cast[2]
Pronunciation /ækˈtɪniəm/
ak-TIN-nee-əm
Actinium 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)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (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)
Siller (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)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (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)
La

Ac

(Uqu)
radiumactiniumthorium
Atomic nummer (Z) 89
Group, block group n/a, f-block
Period period 7
Element category   actinide, sometimes considered a transeetion metal
Staundart atomic wicht (Ar) (227)
Electron configuration [Rn] 6d1 7s2
per shell
2, 8, 18, 32, 18, 9, 2
Pheesical properties
Phase solid
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
2nt: 1170 kJ/mol
Covalent radius 215 pm
Miscellanea
Creestal structur ​face-centred cubic
[[File:face-centred cubic|50px|alt=Face-centred cubic crystal structur for actinium|Face-centred cubic crystal structur for actinium]]
Thermal conductivity 12 W/(m·K)
CAS Nummer 7440-34-8
History
Diskivery an first isolation Friedrich Oskar Giesel (1902)
Maist stable isotopes o actinium
iso NA hauf-life DM DE (MeV) DP
225Ac trace 10 d α 5.935 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

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. ISBN 978-1-4020-3555-5. doi:10.1007/1-4020-3598-5_2.