He proposed the periodic law and developed the first periodic table in 1869. Medeleev's table was arranged according to increasing atomic weight and left holes for elements that were yet to be discovered. His periodic table was not accepted right away. He had to wait until two decades later, when 3 more elements were discovered that fit into the patterns of his table.
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First Periodic Table...Dmitri was the first one to create a periodic table. Although this table does not look like the one we have today, he paved the path so that we could have a better one.
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Periodic Law...States that the physical and chemical properties of the elements recur in a systematic and predictable way when the elements are arranged in order of increasing atomic number.
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