The Dark Ages By D@ni 400 The Dark Ages Period: 400 to Jan 1, 1400 The European Dark Ages Jan 1, 1000 Alchemy Jan 1, 1000 Alchemists tried to change lead into gold Jan 1, 1400 renaissance Jan 1, 1751 Naming The Elements Jan 1, 1897 The Plum Pudding Model (made by Jan 1, 1910 Rutherford's Atom - Theory 2 Jan 1, 1913 Bohr's Atom - Theory 3 Jan 1, 1947 Cold War - The Race Between Jan 1, 2013 Helium Helium was discovered in 1868 by P.Janssen & J.N.Lockyer Sep 19, 2013 Hygrogen Hydrogen is the lightest element ever!it was discovered in 1766 by H.Cavendish
