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Periodic Table Milestones 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 Periodic Table and the Elements Periodic Table of Elements for Kids Periodic Table of Elements Periodic Table Science Videos, Games and Lessons Periodic Table of the Elements in Pictures The Periodic Table: Metals, Nonmetals, and Metalloids - For Dummies Periodic Table Games and Quizzes Math and Periodic Table Game Chemical element games Can you name the Elements of the Periodic Table? Periodic Table Quiz Periodic Table of Elements Quiz Periodic Table for Teachers Printable Periodic Tables - Science Teacher Resources Teachers' Domain: Periodic Table of the Elements The Photographic Periodic Table of the Elements Teacher's Guide to Chemistry's Periodic Table (Video) Periodic Table of the Elements - National Research Council Canada FAQs The periodic table Frequently asked questions Periodic Table FAQs Periodic Table of Hangul FAQ Glossaries and Dictionaries Chemistry and Environmental Dictionary The periodic table glossary Timelines Periodic Table Timeline History of the Periodic Table Periodic table history Museums The Wooden Periodic Table Table The Most Beautiful Periodic Table Displays in the World Museum of the Periodic Table Trivia and Humor Chemistry Jokes and the Periodic Table - Jokes and Science Chemistry Trivia Quiz - General Chemistry Online The Periodic Table Quiz - Jokes and Science Molecules with Silly or Unusual Names - Paul May The Comic Book Periodic Table of the Elements - James F. Holler and John P. Selegue Balloon Molecules - balloonmolecules.com General Periodic Table Resources Quick Chemistry Facts - patent-invent.com Interactive Periodic Table - learner.org 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 The Path to the Periodic Table History of the Periodic Table Periodic Table - Wikipedia The Comic Book Periodic Table of the Elements - James F. Holler and John P. Selegue American Elements Julius Lothar Meyer and Dmitri Ivanovich Mendeleev The Path to the Periodic Table Science Fair Projects and Experiments Chemistry Projects Related Subjects Chemistry Alchemy |
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