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Periodic Table timeline
Category:
Other
Updated:
30 Jul 2021
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Created by
Callum
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Dimitri Mendeleev (1869) constructed a table of rows and columns. He places Elements horizontally according to their atomic mass and vertically according to their properties
English Scientist J.J Thomson (1897) led to the discovery of electrons
Henry Moseley (1913) Determined where elements would go that were out of place from Dimitri's table using atomic mass
Neils Bohr (1913) Proposed the Theory of the Hydrogen Atom
Johann Dobereiner (1829) Discovered similarities between element triads that had chemically similar properties
John Newlands (1864) Proposed classifying the elements in order of increasing atomic weights and were grouped similarly to today's 7 groups (e.g Alkali Metals, Metalloids, ect.)
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