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https://desdelamediterrania.cat/2014/05/01/els-empedocles-moderns-jons-jakob-berzelius-1824-i-lelement-14-si-silici-nilunquadi-nuq/
Els empèdocles moderns – Jöns Jakob Berzelius (1824) i l’element 14 (Si) – silici (nilunquadi, Nuq)