PONOŘTE SE DO SVĚTA ZAJÍMAVÝCH FAKTŮ, NEOBJASNĚNÝCH ZÁHAD A PODIVNÝCH UDÁLOSTÍ
Periodickou tabulku vynalezl ruský chemik Dmitrij Mendělejev v roce 1869. Před Mendělejevem však chemici po desetiletí přemýšleli, jak prvky klasifikovat.
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