What was the importance of Mendeleev’s periodic table to chemists?
Update:
It helped define an element.
It provided a pattern of repeating properties for the elements.
It helped scientists discover previously unknown elements.
It determined the mass of every known element.
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It demonstrated the relationship of chemicals and how they react in quantities. He was not the first with the basic idea of periodicity but the first to present it in a clear way and take the (then) outrageous step of filling in the blanks foreseeing that there were missing elements at specific locations.