Dmitri Mendeleev
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The periodic law states that a large number of the physical and chemical properties of elements recur systematically. This is why the periodic table is arranged as it is, to reflect this pattern.
Properties of elements are a periodic function of their atomic masses.
not known. although it is assumed to be discovered during the 10th century.
Sir Issac Newton
Archimedes, indeed it's law of buoyancy.