Final answer:
Mendeleev's periodic table challenged previous knowledge by organizing elements based on both atomic mass and chemical properties, leading to the prediction of undiscovered elements.
Explanation:
Mendeleev's periodic table revolutionized the field of chemistry as it contradicted earlier findings about element mass and properties. Mendeleev's arrangement of elements based on both atomic mass and chemical properties allowed for the prediction of undiscovered elements and for elements with similar properties to be grouped together.
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