What are three key concepts Dimitri Mendeleev used for his periodic table?
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Mendeleev went even further. He corrected the known atomic masses of some elements and he used the patterns in his table to predict the properties of the elements he thought must exist but had yet to be discovered. He left blank spaces in his chart as placeholders to represent those unknown elements.
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● left blanks for unknown elements
● predicted properties of unknown elements
● rectified the mass of some elements such as boron
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