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Alexandre-Emile Béguyer de Chancourtois
A list of element was created by the French geologist Alexandre-Emile Béguyer de Chancourtois on paper tape and wounded into a cylinder which was spiral like. Elements were grouped so that each group had three elements which has similar properties. This model was called the telluric screw. -
John Newlands
It was noticed by the English chemist John Newlands that there was a periodic similarity between every 8 elements if the elements are ordered by the atomic weight. He proposed his law of octaves on this. -
Lothar Meyer
Lothar Meyer put a periodic table of 56 elements together because of a repeating pattern of physical properties such as molar volume. They were also in order of atomic weights. -
Dmitri Mendeleev
A periodic table based on atomic weights but arranged periodically was created by Dmitri Mendeleev a Russian Chemist. There were gaps for unknown elements and elements with similar properties appeared underneath each other. -
William Ramsay
Noble gases were discovered by William Ramsay and this discovery created a new group in the periodic table. -
Glenn Seaborg
A block of the periodic table which are called actinides are full of new elements. Glenn Seaborg artificially created heavy mass elements such as neptunium.