The Periodic Table. Chapter 6. Why is the Periodic Table important to me?. The periodic table is the most useful tool to a chemist. You get to use it on every test. It organizes lots of information about all the known elements. Pre-Periodic Table Chemistry …. …was a mess!!!
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Put elements in rows by increasing atomic weight.
Put elements in columns by the way they reacted.
He left blank spaces for what he said were undiscovered elements. (Turned out he was right!)
He broke the pattern of increasing atomic weight to keep similar reacting elements together.Dmitri Mendeleev: Father of the Table
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