apr 30, 1864 - Newlands was the first person to devise a periodic table of elements arranged in order of their relative atomic masses. Continuing Johann Wolfgang Döbereiner's work with triads. It ultimately helped him publish his 'Law of Octaves', which stated that 'any given element will exhibit analogous behaviour to the eighth element following it in the table.
Added to timeline:
Date:
apr 30, 1864
Now
~ 161 years ago