Dmitri Mendeleev first organized the periodic table by atomic mass. Later, Henry Moseley improved the design of the periodic table by organizing the columns into families.
<h3>How was the periodic table created?</h3>
Dmitri Mendeleev (1834-1907), in 1869, while in Russia, had the same idea as Meyer, who was studying in Germany. He more meticulously arranged a periodic table where the 63 known chemical elements were arranged in columns based on their atomic masses.
With this information, we can conclude that Dmitri Mendeleev first organized the periodic table by atomic mass. Later, Henry Moseley improved the design of the periodic table by organizing the columns into families.
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