What is Mendeleev known for?

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Mendeleev is known for publishing the first comprehensive periodic table of elements, organized by increasing atomic weight and by recurring chemical properties. He showed that elements with similar behaviors appear at regular intervals, and he even left gaps for elements not yet discovered, accurately predicting their properties. This organized layout, later refined with atomic numbers, became the foundation for understanding element relationships and chemical behavior. He did not discover the electron (that was J.J. Thomson), nor measure the speed of light, nor propose the law of gravity (that was Newton).