خط زمني لاكتشافات العناصر الكيميائية - المعرفة
خط زمني لاكتشافات العناصر الكيميائية . The discovery of the elements known to exist today is presented here in chronological order. The elements are listed generally in the order in which each was first defined as the pure element, as the exact date of discovery of most elements cannot be accurately defined. Given is each element''s name, atomic number, year of ...
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