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What trends were used to first classify the elements of the periodic table?

What trends were used to first classify the elements of the periodic table? What trends were discovered after the elements were classified in the periodic table?

Public Comments

1. Valence electrons are what determine the most important chemical properties of an atom, so Gregor Mendel arranged the first periodic table by number of electrons.
2. Here is an article about the periodic table. Hope this helps you... http://www.ehow.com/how_4598879_use-periodic-table.html