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https://desdelamediterrania.cat/2014/02/13/els-empedocles-moderns-johan-august-arfwedson-1817-i-lelement-3-li-liti-nilniltrii-nnt/
Els empèdocles moderns – Johan August Arfwedson (1817) i l’element 3 (Li) – liti (nilniltrii, Nnt)