Periodic Table Milestones


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1789: Antoine Lavoisier (French) published a list of 33 chemical elements grouped into gases, metals, nonmetals, and earths.

1829: Johann Wolfgang Dobereiner (German) observed that many of the elements when grouped into groups of three (triads) based on their chemical properties and arranged by atomic weight, the second member of each triad was roughly the average of the first and the third (Law of Triads).

1843: Leopold Gmelin (German) identified ten triads, three groups of four, and one group of five elements.

1857: Jean Baptiste Dumas (French) described relationships between various groups of metals.

1858: August Kekule (German) observed that carbon has a tendency to bond with other elements in a ratio of one to four. This concept eventually became known as valency.

1864: Julius Lothar Meyer (German) published a table of the 49 known elements of his time arranged by valency. The table revealed that elements with similar properties often shared the same valency.

1864: John Newlands (English) described his own classification of the elements and noted that when listed in order of increasing atomic weight, similar physical and chemical properties recurred at intervals of eight. Based on this, Newlands was able to draft an atomic table and use it to predict the existence of missing elements, such as germanium.

1869: Dmitri Mendeleev (Russian) developed the modern periodic table as it is known today.

1898: William Ramsay (Scottish) discoverd the noble gases - a new group in the periodic table.

1939: Marguerite Perey (French) discovered francium (maybe the last naturally occurring element) based on filling gapes in Mendeleev's periodic table.

1940: Glenn Seaborg (American) discovered plutonium and orher transuranium elements (with Edwin McMillan).

2000: Russian Scientists at Dubna detected a single decay from an atom of ununhexium.


Periodic Table for Kids
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Atomic Structure and the Periodic Table - Stephen Lower, Simon Fraser University
Periodic Table and More - chemicool.com
The Wooden Periodic Table Table - Theodore W. Gray
Periodic Table - chem4kids.com
The Visual Elements Periodic Table - chemsoc.org
WebElements Periodic Table
Periodic Table of Elements - EnvironmentalChemistry.com
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Julius Lothar Meyer and Dmitri Ivanovich Mendeleev
The Path to the Periodic Table

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