Chemistry-periodic table of the elements- M. Pad Mouse Pad

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Dmitri Ivanovich Mendeleev. Mendeleev created a table or chart that listed the known elements according to increasing order of atomic weights; creating a framework for modern chemical and physical theory. Involves classifying the basic building blocks of matter. (gallium in 1875, of scandium in 1879, and of germanium in 1886. was the atomic weight of each element: how heavy its atoms were in comparison to an atom of hydrogen, the lightest element-elements have been arranged on the periodic table according to their atomic numbers.)

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