bn:03728857n
Noun Concept
EL
Χημικά στοιχεία που προβλέφθηκαν από το Ντμίτρι Μεντελέγιεφ
EN
Dmitri Mendeleev published a periodic table of the chemical elements in 1869 based on properties that appeared with some regularity as he laid out the elements from lightest to heaviest. Wikipedia
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