Johann Wolfgang Döbereiner Germanchemist

May 5th, 2015
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(13 December 1780 – 24 March 1849) was a Germanchemist who is best known for work that foreshadowed the periodic law for the chemical elements Johann Wolfgang Döbereiner

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Johann Wolfgang Dbereiner(13 December 1780 24 March 1849) was a German chemist who is best known for work that foreshadowed the periodic law for the chemical elementsTriadsIn the year 1829, Johann Wolfgang Dobereiner, a German scientist, was the first to classify elements into groups based on John Dalton's assertions. He grouped the elements with similar chemical properties into clusters of three called 'Triads'. The distinctive feature of a triad was the atomic mass of the middle element. When elements were arranged in order of their increasing atomic mass, the atomic mass of the middle element was approximately the arithmetic mean of the other two elements of the triad.John Alexander Reina NewlandsOctet RuleSays that atoms tend to gain, lose or share electrons so as to have eight electrons in their outer electron shell. It is a very useful rule but you should also know that there are many bonding situations where it does not apply. As you learn to use the octet rule, also learn to recognize situations where it does not apply and disregard it in those situations.Julius Lothar Meyer Dmitri Ivanovich MendeleevJulius Lothar Meyer (18301895) and Dmitri Ivan

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