A HISTORY OF THE P E R I O D I C TA B L E T H E M O D E R N P E R I O D I C TA B L E P L AT O ( 3 6 0 B C ) STOICHEA → “ELEMENTS” T H E F I R S T P E R I O D I C TA B L E ARISTOTLE’S PERIODIC TA B L E ( 3 5 0 B C ) ELEMENTS FROM ANTIQUITY • carbon • gold • copper • silver • lead • sulfur • iron • tin • mercury • zinc Prior to 1500 arsenic, antimony and bismuth added. By 1750, phosphorus, cobalt and platinum had been added. CHEMICAL TRIADS (1817) JOHANN WOLFGANG DOBEREINER Examples of Döbereiner’s Triads Li Na K Examples of Döbereiner’s Triads Ca Sr Ba Examples of Döbereiner’s Triads Cl Br I AT O M I C M A S S E S ( 1 8 2 6 - 1 8 6 0 ) JEAN BAPTISTE ANDRÉ DUMAS M E Y E R ’ S TA B L E ( 1 8 6 4 ) JULIUS LOTHAR MEYER M E Y E R ’ S P E R I O D I C TA B L E N E W L A N D S ’ O C TA V E S ( 1 8 6 5 ) JOHN NEWLANDS N E W L A N D S ’ P E R I O D I C TA B L E F AT H E R O F T H E P E R I O D I C TA B L E ( 1 8 6 9 ) DIMITRI I VA N O V I C H MENDELEEV M E N D E L E E V ’ S 1 8 6 9 TA B L E M E N D E L E E V ’ S 1 8 7 1 TA B L E MAPPING THE MODERN P E R I O D I C TA B L E