The Earlier Table of the Elements
One of the first proper stabs at developing a table of the elements was by John Dalton. By testing the known elements’ reactions he arranged them all in order of m***. John Newlands built on Dalton’s table using the law of octaves, suggesting that every eight element had similar properties.
The problem with Newlands’ table was that he was too determined to get it done and working that he made some mistakes. What he didn’t know was that there were still many elements to be found, so he filled in octaves regardless of their properties. Another problem was that he mixed metals and non metals.
Towards the late 1860s, Russian scientist Dmitri Mendeleev created a very promising table. By this time, fifty elements had been discovered, and Mendeleev arranged them all in…