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Development of the periodic table
(1817) Johann Dobereiner proposed the law of triads
(1862) Alexandre-Émile Béguyer de Chancourtois shows that similar elements appear at periodic atom weights
(1864) Lothar Meyer had just discovered valency and periodic behabiour
(1864) John Newlands put forward is law of octaves. Each element was similar to the element eight places further on.
(1869) Dmitiri Mendeleev arranged the elements known at the time in order of relative atomic mass to form the periodic table
(1894) Lord Rayleigh discovered the first inert gas and how to seperate compounds
(1898) William Ramsay discovered a previously unknown class of inert, rare, or noble gases
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