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Chemistry Open-book Paper In 1817 a scientist by the name of Johann Dobereiner was the first to attempt to classify elements using their relative atomic mass. He found that some elements had similar properties, and put them into a group called a triad, for instance Li, Na and K. He found that the middle element in each group had a mass which is equal to the average of the other two. This also applies to several other groups. The British chemist, John Newlands arranged the elements in order of relative atomic mass in 1866. H Li Be B C N O F Na Mg Al Si P S Cl K Ca Newlands noticed that similar elements appeared at regular intervals in the list. He arranged the elements in the following columns: H Li Be B C N O F Na Mg Al Si P S Cl K Ca Cr Ti Ma Fe Newlands drew up a law of octaves where by he compared his chemical 'octaves' with musical octaves. It was a Russian chemist, Dimitri Mendeleev, who...

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