The periodic law was invented by Dmitri Mendeleev. His idea that elements arrange themselves according to their atomic weight and other properties is the periodic law. He proposed this idea on March 6, 1869, in his paper entitled " The Dependence Between the Properties of the Atomic Weights of the Elements ." During his reading of the paper he stated " The elements , if arranged according to their atomic weights, exhibit an apparent periodicity of properties." He also created an outline for the periodic table suggesting that the elements arrange themselves into an order depending on their valences and properties. Expanding on this logic, he stated, Nov. 29, 1870, that other elements could be predicted based on gaps in the periodic table.
In confirmation of Mendeleev's theory, Gallium, Scandium, and Germanium were discovered and placed on the periodic table where he predicted.
In confirmation of Mendeleev's theory, Gallium, Scandium, and Germanium were discovered and placed on the periodic table where he predicted.