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Although carbon and silicon are members of the same family in the periodic table of elements, they seem unrelated because carbon dioxide is typically a gas whereas silicon dioxide, or silica, is commonly crystalline quartz or glass. When young Dmitrii Mendeleev drafted the Periodic Table of Elements as a guide for his chemistry students, he was already dreaming of building a scientific empire in his home of Russia--with himself at its center. The Roman numerals refer to families on the periodic table of elements. |
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