Elements Timeline 1 By Mt Carne Jan 1, 1480 Zi[nc Discovered Jan 1, 1649 Arsnic Discovered Jan 1, 1669 Phosphorus Discovered Jan 1, 1735 Cobalt Discovered Jan 1, 1744 Oxygen Discovered Jan 1, 1766 Hydrogen Discovered Jan 1, 1783 Tungsten Discovered Jan 1, 1799 Electric Battery Invented Jan 1, 1807 Potassium Discovered Jan 1, 1808 Calcium Discovered Jan 1, 1825 Aluminium Discovered Jan 1, 1826 Bromine Discovered Jan 1, 1895 Helium Discovered Jan 1, 1898 Radium Discovered Jan 1, 1952 Einsteinium Discovered