aktinyum (ac)

listen to the pronunciation of aktinyum (ac)
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(Nükleer Bilimler) actinium
A supposed metal, said by Phipson to be contained in commercial zinc; so called because certain of its compounds are darkened by exposure to light
a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores
{i} (Ac) radioactive metallic element (Chemistry)