# Periodic Table of the Elements The periodic table itself is a meta technology * 1680 - Robert Boyle/Hennig Brand discovered Phosphorous * 1808 - Robert Dalton published a way to determine atomic weights * 1815 - William Prout noticed that atomic weights were a multiple of hydrogen * 1817 -> 1829 - Johann Wolfgang Döbereiner grouped elements into triads with shared properties * 1862 - Alexandre-Émile Béguyer de Chancourtois arranged elements [Web URL for this note](http://notes.benjaminreinhardt.com/Periodic+Table+of+the+Elements) [Comment on this note](http://via.hypothes.is/http://notes.benjaminreinhardt.com/Periodic+Table+of+the+Elements)