Discovery of the Elements By 2268 Aug 1, 1766 Discovery of Hydrogen Aug 1, 1771 Discovery of Oxygen Aug 1, 1772 Discovery of Nitrogen Aug 1, 1798 Discovery of Beryllium Aug 1, 1808 Discovery of Boron Aug 1, 1817 Discovery of Lithium Aug 1, 1868 Discovery of Helium Aug 1, 2012 Discovery of Fluorine 1886