Element+Timeline+information

Timeline information:

Group 1 Gold 6000BC Copper 4200BC Silver 4000BC Lead 3500BC Tin 1750BC Iron 1500BC Mercury 750BC

Group 2 Lithium 1817 Chlorine 1774 Osmium 1803 Helium 1868 Barium 1808

t__otal time__ = __years__ __t__otal cm cm