Actinium Ac

Ac Actinium. Also used for acetate (ethan-oate). 

Ac, actinium, was initially identified in 1899 by Andr6-Louis Debierne, a French chemist, who separated it from pitchblende. He dissolved the mineral in acid, then added NH4OH, and found that a radioactive species was carried down with the rare earth hydroxides. He named the element actinium after the Greek aktinos which means ray. Because of its low abundance in U, the element is usually not obtained by isolation from U. It can be obtained in mlligram amounts by irradiation of Ra-226 in a nuclear reactor. The preparation of Ac metal involves reduction of AcFs by Li at high temperature. 

Ho Holmium Er Erbium Tm Thulium Yb Ytterbium Lu l.utetium f Hf Hafnium Ta Tantalum W Wolfram f Re Rhenium Os Osmium Ir Iridium Pt Platinum Au Gold Hg Mercury Tl Thallium Pb Lead Bi Bismuth Po Polonium At Astatine f Rn Radon Fr Francium f Ra Radium Ac Actinium Th Thorium Pa Protactinium U Uranium Np Neptunium f Pu Plutonium f Am Americium f Cm Curium f Bk Berkelium f Cf Californium i... 

Ac actinium, 89, 1899 named after the Greek aktis (ray) since it is radioactive. 

AC actinium 104 Rf uthertordium 105 Db dubnium 106 Sg seaborgium 107 Bh bohrium 108 Hs hassium 109 Mt meitnerium 110 Ds darmsladlium m Rg roentgenium 112 Uub ununbium... 

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