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https://desdelamediterrania.cat/2014/08/28/els-empedocles-moderns-paul-emile-lecoq-de-boisbaudran-1875-i-lelement-31-ga-gal%e2%80%a2li-niltriuni-ntu/
Els empèdocles moderns – Paul-Émile Lecoq de Boisbaudran (1875) i l’element 31 (Ga) – gal•li (niltriuni, Ntu)