At the end of each row, a drastic shift occurs in chemical properties. As one moves from left to right in a row of the periodic table, the properties of the elements gradually change. The modern periodic table of elements is based on Mendeleev's observations however, instead of being organized by atomic weight, the modern table is arranged by atomic number (z). The Periodic Table of Elements Arrangement of the modern periodic table
To account for these repeating trends, Mendeleev grouped the elements in a table that had both rows and columns. Mendeleev had tried to organize the chemical elements according to their atomic weights, assuming that the properties of the elements would gradually change as atomic weight increased. What he found, however, was that the chemical and physical properties of theĮlements increased gradually and then suddenly changed at distinct In 1869, the Russian chemist Dmitri Mendeleev first proposed that the chemical elements exhibited a "periodicity of properties." Understanding Scientific Journals and Articles.Using Graphs and Visual Data in Science.Scientists and the Scientific Community.
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