سؤال قراءة ستيب محلول — فهم التفاصيل (تدريب 4711)

Dmitri Mendeleyev has been hailed as the “genius who discovered the periodic table”. However, Mendeleyev wasn’t even the third person to come up with the idea of the periodic table. That honor belongs to the German chemist and physician Lothar Meyer 1830-1895). Meyer wrote a popular book, The Modern theory of chemistry published in. While he was preparing the book, he noticed the relationship between the properties of a chemical element and its atomic weight.