How Was the First Periodic Table Arranged?
Dmitri Mendeleev sorted elements by increasing atomic mass and put those with similar properties in the same column. Genius move!
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Mendeleev arranged the first periodic table by atomic weight and grouped elements with similar properties into columns. Cool, right?
By atomic weight primarily. It wasn鈥檛 perfect, but it worked!
I read that Mendeleev not only ordered the elements by atomic weight but also left gaps predicting undiscovered elements. Pretty impressive, huh?
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