1864- John Newlands put the known elements in order based on their atomic weights and other similarites.
1864- Dmitri Mendeleev made a periodic table based on element's atomic weights but he put elements with like properties under one another. His table included 66 known elements.
1894- Noble Gases were discovered by William Ramsay.
1913- Henry Moseley placed each element with their atomic number.
Beginning-1940s - New elements have been found and placed on the periodic table according to their atomic weights and properties.
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