Johann Wolfgang Dobereiner, German chemist C047/4085

Johann Wolfgang Dobereiner, German chemist

Código da imagem : C047/4085
Dimensões : 2.867 X 3.661 pixels
Orientação : horizontal

Data do upload no fornecedor : 12/09/2019
Tamanho máximo não comprimido : 30,0MB

Pauta:	Johann Wolfgang Dobereiner, German chemist
Título:	Johann Wolfgang Dobereiner, German chemist
Descrição:	Johann Wolfgang Dobereiner (1780-1849), German chemist. Dobereiner improved organic analysis, studied the action of catalysts, and made the first estimates of the abundance of elements in the Earth's crust. His main claim to fame is his observation of triads of elements. These are groups such as chlorine, bromine and iodine in which the atomic mass of the middle element is close to the mean of the first and last elements in its group; and its physical and chemical properties likewise appear average. By 1829 this was developed as the Law of Triads. It attracted little attention then, but can now be seen as a step towards the periodic table. Dobereiner was a professor of chemistry and pharmacy at the c. This portrait, by Fritz Ries, is from the Dibner Library of the History of Science and Technology.
Coleção:	Science Photo Library
Crédito:	SMITHSONIAN INSTITUTION/SCIENCE PHOTO LIBRARY/ Fotoarena
Disponibilidade:	imediata
Direito de uso:	Direito controlado
Autorização do(a) modelo:	não
Autorização da propriedade:	não

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