Dmitri Mendeleev revolutionized our understanding of the properties of atoms and created a table that probably adorns every chemistry classroom in the world. In the late 1860s, Mendeleev began working on his great achievement: the periodic table of the elements. by arranging all of the 63 elements than known by their atomic weights, he managed to organize them into groups possessing similar properties. Where a gap existed in the table, he predicted a new element would one day be found and deducted its properties. and he was right. Three of those elements were found during his lifetime: gallium, scandium, and germanium. Mendeleev was able to successfully predict the properties of three elements that had not yes been discovered. The discovery of these elements provided the strongest support for his periodic table, a cornerstone both in chemistry and in our understanding of how universe is put together.
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