Final answer:
Dmitri Mendeleev and Julius Lothar Meyer made significant contributions to the development of the modern periodic table.
Explanation:
Dmitri Mendeleev and Julius Lothar Meyer independently developed arrangements of the elements based on relationships between atomic mass and properties, contributing to the modern periodic table. Mendeleev's table included gaps for undiscovered elements, which were later found, validating his predictions and leading to the acceptance of his version of the periodic table.
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