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</html><description>&#xC9; o elemento que encabe&#xE7;a a s&#xE9;rie qu&#xED;mica denominada Actin&#xED;deos ou Actin&#xF3;ides. Seu comportamento &#xE9; semelhante ao do lant&#xE2;nio, geralmente &#xE9; encontrado em vest&#xED;gios de minerais de ur&#xE2;nio e apresenta alta radioatividade. Ent&#xE3;o descubra mais caracter&#xED;sticas e propriedades do Actinium. O que &#xE9; Act&#xED;nio? &#xC9; um elemento met&#xE1;lico de transi&#xE7;&#xE3;o interna com a s&#xE9;rie Lanthanidos, ... Ler mais</description></oembed>
